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cpdf-source
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This commit is contained in:
John Whitington 2021-12-22 08:58:56 +00:00
parent 6954183241
commit e3acc74ecd
10 changed files with 887 additions and 869 deletions
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2
Makefile
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@ -4,7 +4,7 @@ MODS = cpdfyojson cpdfxmlm cpdfutil \
cpdfattach cpdfpagespec cpdfposition cpdfpresent cpdfmetadata \ cpdfattach cpdfpagespec cpdfposition cpdfpresent cpdfmetadata \
cpdfbookmarks cpdfpage cpdfaddtext cpdf cpdfimage cpdffont cpdftype \ cpdfbookmarks cpdfpage cpdfaddtext cpdf cpdfimage cpdffont cpdftype \
cpdftexttopdf cpdftoc cpdfpad cpdfocg cpdfsqueeze cpdfdraft cpdfspot \ cpdftexttopdf cpdftoc cpdfpad cpdfocg cpdfsqueeze cpdfdraft cpdfspot \
cpdfpagelabels cpdfcreate cpdfannot cpdfxobject cpdfcommand cpdfpagelabels cpdfcreate cpdfannot cpdfxobject cpdfimpose cpdfcommand
SOURCES = $(foreach x,$(MODS),$(x).ml $(x).mli) cpdfcommandrun.ml SOURCES = $(foreach x,$(MODS),$(x).ml $(x).mli) cpdfcommandrun.ml

806
cpdf.ml
View File

@ -3,10 +3,6 @@ open Pdfutil
open Pdfio open Pdfio
open Cpdferror open Cpdferror
(* For uses of process_pages which don't need to deal with matrices, this
function transforms into one which returns the identity matrix *)
let ppstub f n p = (f n p, n, Pdftransform.i_matrix)
(* Add stack operators to a content stream to ensure it is composeable. On (* Add stack operators to a content stream to ensure it is composeable. On
-fast, we don't check for Q deficit, assuming PDF is ISO. *) -fast, we don't check for Q deficit, assuming PDF is ISO. *)
let protect fast pdf resources content = let protect fast pdf resources content =
@ -24,55 +20,6 @@ let protect fast pdf resources content =
let qs = addstream (many Pdfops.Op_Q deficit @ [Pdfops.Op_Q]) in let qs = addstream (many Pdfops.Op_Q deficit @ [Pdfops.Op_Q]) in
[Pdf.Indirect q] @ content @ [Pdf.Indirect qs] [Pdf.Indirect q] @ content @ [Pdf.Indirect qs]
(* If a cropbox exists, make it the mediabox. If not, change nothing. *)
let copy_cropbox_to_mediabox pdf range =
Cpdfpage.process_pages
(ppstub (fun _ page ->
match Pdf.lookup_direct pdf "/CropBox" page.Pdfpage.rest with
| Some pdfobject -> {page with Pdfpage.mediabox = Pdf.direct pdf pdfobject}
| None -> page))
pdf
range
(* Union two resource dictionaries from the same PDF. *)
let combine_pdf_resources pdf a b =
let a_entries =
match a with
| Pdf.Dictionary entries -> entries
| _ -> []
in let b_entries =
match b with
| Pdf.Dictionary entries -> entries
| _ -> []
in
let resource_keys =
["/Font"; "/ExtGState"; "/ColorSpace"; "/Pattern";
"/Shading"; "/XObject"; "/Properties"]
in
let combine_entries key =
let a_entries =
match Pdf.lookup_direct pdf key a with
| Some (Pdf.Dictionary d) -> d
| _ -> []
in let b_entries =
match Pdf.lookup_direct pdf key b with
| Some (Pdf.Dictionary d) -> d
| _ -> []
in
if a_entries = [] && b_entries = [] then
None
else
Some (key, Pdf.Dictionary (a_entries @ b_entries))
in
let unknown_keys_a = lose (fun (k, _) -> mem k resource_keys) a_entries in
let unknown_keys_b = lose (fun (k, _) -> mem k resource_keys) b_entries in
let combined_known_entries = option_map combine_entries resource_keys in
fold_left
(fun dict (k, v) -> Pdf.add_dict_entry dict k v)
(Pdf.Dictionary [])
(unknown_keys_a @ unknown_keys_b @ combined_known_entries)
(* Does the page have a defined box e.g "/CropBox" *) (* Does the page have a defined box e.g "/CropBox" *)
let hasbox pdf page boxname = let hasbox pdf page boxname =
let pages = Pdfpage.pages_of_pagetree pdf in let pages = Pdfpage.pages_of_pagetree pdf in
@ -83,192 +30,6 @@ let hasbox pdf page boxname =
| _ -> false | _ -> false
(* \section{Shift page data} *)
let make_mediabox (xmin, ymin, xmax, ymax) =
Pdf.Array
[Pdf.Real xmin; Pdf.Real ymin; Pdf.Real xmax; Pdf.Real ymax]
(* Change the media box and other known boxes by the function [f] which takes
xmin, xmax, ymin, ymax as input. *)
let change_boxes f pdf page =
let names = ["/TrimBox"; "/ArtBox"; "/CropBox"; "/BleedBox"]
in let getbox n =
Pdf.lookup_direct pdf n page.Pdfpage.rest
in
let boxes = combine names (map getbox names) in
let toreplace = lose (function (_, None) -> true | _ -> false) boxes in
let toreplace =
map
(function (name, Some value) -> (name, value) | _ -> assert false)
toreplace
in
let rest' =
fold_left
(fun e (k, v) ->
let v =
make_mediabox (f (Pdf.parse_rectangle v))
in
Pdf.replace_dict_entry e k v)
page.Pdfpage.rest
toreplace
in
{page with
Pdfpage.mediabox =
make_mediabox (f (Pdf.parse_rectangle page.Pdfpage.mediabox));
Pdfpage.rest = rest'}
(* The content transformed by altering any use of [Op_cm]. But we must also
alter any /Matrix entries in pattern dictionaries *)
let change_pattern_matrices_resources pdf tr resources =
try
begin match Pdf.lookup_direct pdf "/Pattern" resources with
| Some (Pdf.Dictionary patterns) ->
let entries =
map
(fun (name, p) ->
(*Printf.printf "Changing matrices of pattern %s\n" name;*)
let old_pattern = Pdf.direct pdf p in
let new_pattern =
let existing_tr = Pdf.parse_matrix pdf "/Matrix" old_pattern in
let new_tr = Pdftransform.matrix_compose (Pdftransform.matrix_invert tr) existing_tr in
Pdf.add_dict_entry old_pattern "/Matrix" (Pdf.make_matrix new_tr)
in
name, Pdf.Indirect (Pdf.addobj pdf new_pattern))
patterns
in
Pdf.add_dict_entry resources "/Pattern" (Pdf.Dictionary entries)
| _ -> resources
end
with
Pdftransform.NonInvertable ->
Printf.eprintf "Warning: noninvertible matrix\n%!";
resources
let change_pattern_matrices_page pdf tr page =
let page =
{page with Pdfpage.resources = change_pattern_matrices_resources pdf tr page.Pdfpage.resources}
in
match Pdf.lookup_direct pdf "/XObject" page.Pdfpage.resources with
| Some (Pdf.Dictionary elts) ->
iter
(fun (k, v) ->
match v with
| Pdf.Indirect i ->
(* Check if it's a form XObject. If so, rewrite its resources and add back as same number. *)
begin match Pdf.lookup_direct pdf "/Subtype" v with
| Some (Pdf.Name "/Form") ->
(*Printf.printf "Processing form xobject %s for patterns\n" k; *)
let form_xobject = Pdf.lookup_obj pdf i in
begin match Pdf.lookup_direct pdf "/Resources" form_xobject with
| Some resources ->
let form_xobject' =
Pdf.add_dict_entry form_xobject "/Resources" (change_pattern_matrices_resources pdf tr resources)
in
Pdf.addobj_given_num pdf (i, form_xobject')
| _ -> ()
end
| _ -> ()
end;
| _ -> raise (Pdf.PDFError "change_pattern_matrices_page"))
elts;
page
| _ -> page
let transform_rect transform rect =
let minx, miny, maxx, maxy = Pdf.parse_rectangle rect in
let (x0, y0) = Pdftransform.transform_matrix transform (minx, miny) in
let (x1, y1) = Pdftransform.transform_matrix transform (maxx, maxy) in
let (x2, y2) = Pdftransform.transform_matrix transform (minx, maxy) in
let (x3, y3) = Pdftransform.transform_matrix transform (maxx, miny) in
let minx = fmin (fmin x0 x1) (fmin x2 x3) in
let miny = fmin (fmin y0 y1) (fmin y2 y3) in
let maxx = fmax (fmax x0 x1) (fmax x2 x3) in
let maxy = fmax (fmax y0 y1) (fmax y2 y3) in
Pdf.Array [Pdf.Real minx; Pdf.Real miny; Pdf.Real maxx; Pdf.Real maxy]
let transform_quadpoint_single transform = function
| [x1; y1; x2; y2; x3; y3; x4; y4] ->
let x1, y1, x2, y2, x3, y3, x4, y4 =
Pdf.getnum x1, Pdf.getnum y1,
Pdf.getnum x2, Pdf.getnum y2,
Pdf.getnum x3, Pdf.getnum y3,
Pdf.getnum x4, Pdf.getnum y4
in
let (x1, y1) = Pdftransform.transform_matrix transform (x1, y1) in
let (x2, y2) = Pdftransform.transform_matrix transform (x2, y2) in
let (x3, y3) = Pdftransform.transform_matrix transform (x3, y3) in
let (x4, y4) = Pdftransform.transform_matrix transform (x4, y4) in
map (fun x -> Pdf.Real x) [x1; y1; x2; y2; x3; y3; x4; y4]
| qp ->
Printf.eprintf "Malformed /QuadPoints format: must be a multiple of 8 entries\n";
qp
let transform_quadpoints transform = function
| Pdf.Array qps ->
Pdf.Array (flatten (map (transform_quadpoint_single transform) (splitinto 8 qps)))
| qp ->
Printf.eprintf "Unknown or malformed /QuadPoints format %s\n" (Pdfwrite.string_of_pdf qp);
qp
(* Apply transformations to any annotations in /Annots (i.e their /Rect and /QuadPoints entries) *)
let transform_annotations pdf transform rest =
match Pdf.lookup_direct pdf "/Annots" rest with
| Some (Pdf.Array annots) ->
(* Always indirect references, so alter in place *)
iter
(function
| Pdf.Indirect i ->
let annot = Pdf.lookup_obj pdf i in
let rect' =
match Pdf.lookup_direct pdf "/Rect" annot with
| Some rect -> transform_rect transform rect
| None -> raise (Pdf.PDFError "transform_annotations: no rect")
in
let quadpoints' =
match Pdf.lookup_direct pdf "/QuadPoints" annot with
| Some qp -> Some (transform_quadpoints transform qp)
| None -> None
in
let annot = Pdf.add_dict_entry annot "/Rect" rect' in
let annot =
match quadpoints' with
| Some qp -> Pdf.add_dict_entry annot "/QuadPoints" qp
| None -> annot
in
Pdf.addobj_given_num pdf (i, annot)
| _ -> Printf.eprintf "transform_annotations: not indirect\n%!")
annots
| _ -> ()
let shift_page ?(fast=false) dxdylist pdf pnum page =
let dx, dy = List.nth dxdylist (pnum - 1) in
let transform_op =
Pdfops.Op_cm (Pdftransform.matrix_of_op (Pdftransform.Translate (dx, dy)))
in
let page =
change_pattern_matrices_page pdf (Pdftransform.mktranslate ~-.dx ~-.dy) page
in
transform_annotations pdf (Pdftransform.mktranslate dx dy) page.Pdfpage.rest;
(Pdfpage.prepend_operators pdf [transform_op] ~fast page, pnum, Pdftransform.mktranslate dx dy)
let shift_pdf ?(fast=false) dxdylist pdf range =
Cpdfpage.process_pages (shift_page ~fast dxdylist pdf) pdf range
(* Change a page's media box so its minimum x and y are 0, making other
operations simpler to think about. Any shift that is done is reflected in
other boxes (clip etc.) *)
let rectify_boxes ?(fast=false) pdf page =
let minx, miny, _, _ =
Pdf.parse_rectangle page.Pdfpage.mediabox
in
let f (iminx, iminy, imaxx, imaxy) =
iminx -. minx, iminy -. miny, imaxx -. minx, imaxy -. miny
in
let page = change_boxes f pdf page in
if minx <> 0. || miny <> 0.
then
begin let p, _, _ = shift_page ~fast [(-.minx),(-.miny)] pdf 1 page in p end
else page
(* \section{Flip pages} *) (* \section{Flip pages} *)
let flip_page ?(fast=false) transform_op pdf pnum page = let flip_page ?(fast=false) transform_op pdf pnum page =
@ -276,8 +37,8 @@ let flip_page ?(fast=false) transform_op pdf pnum page =
Pdf.parse_rectangle page.Pdfpage.mediabox Pdf.parse_rectangle page.Pdfpage.mediabox
in in
let tr = transform_op minx miny maxx maxy in let tr = transform_op minx miny maxx maxy in
let page = change_pattern_matrices_page pdf tr page in let page = Cpdfutil.change_pattern_matrices_page pdf tr page in
transform_annotations pdf tr page.Pdfpage.rest; Cpdfutil.transform_annotations pdf tr page.Pdfpage.rest;
(Pdfpage.prepend_operators pdf [Pdfops.Op_cm tr] ~fast page, pnum, tr) (Pdfpage.prepend_operators pdf [Pdfops.Op_cm tr] ~fast page, pnum, tr)
let vflip_pdf ?(fast=false) pdf range = let vflip_pdf ?(fast=false) pdf range =
@ -365,9 +126,9 @@ let do_stamp relative_to_cropbox fast position topline midline scale_to_fit isov
(if relative_to_cropbox then [Pdftransform.Translate (txmin, tymin)] else []) @ (if relative_to_cropbox then [Pdftransform.Translate (txmin, tymin)] else []) @
[Pdftransform.Scale ((sxmin, symin), scale, scale)])) [Pdftransform.Scale ((sxmin, symin), scale, scale)]))
in in
transform_annotations pdf matrix o.Pdfpage.rest; Cpdfutil.transform_annotations pdf matrix o.Pdfpage.rest;
let r = Pdfpage.prepend_operators pdf [Pdfops.Op_cm matrix] ~fast o in let r = Pdfpage.prepend_operators pdf [Pdfops.Op_cm matrix] ~fast o in
change_pattern_matrices_page pdf matrix r Cpdfutil.change_pattern_matrices_page pdf matrix r
else else
let sw = sxmax -. sxmin and sh = symax -. symin let sw = sxmax -. sxmin and sh = symax -. symin
and w = txmax -. txmin and h = tymax -. tymin in and w = txmax -. txmin and h = tymax -. tymin in
@ -377,9 +138,9 @@ let do_stamp relative_to_cropbox fast position topline midline scale_to_fit isov
((if relative_to_cropbox then [Pdftransform.Translate (txmin, tymin)] else []) @ ((if relative_to_cropbox then [Pdftransform.Translate (txmin, tymin)] else []) @
[Pdftransform.Translate (dx, dy)])) [Pdftransform.Translate (dx, dy)]))
in in
transform_annotations pdf matrix o.Pdfpage.rest; Cpdfutil.transform_annotations pdf matrix o.Pdfpage.rest;
let r = Pdfpage.prepend_operators pdf [Pdfops.Op_cm matrix] ~fast o in let r = Pdfpage.prepend_operators pdf [Pdfops.Op_cm matrix] ~fast o in
change_pattern_matrices_page pdf matrix r Cpdfutil.change_pattern_matrices_page pdf matrix r
in in
{u with {u with
Pdfpage.content = Pdfpage.content =
@ -389,7 +150,7 @@ let do_stamp relative_to_cropbox fast position topline midline scale_to_fit isov
Pdfpage.rest = Pdfpage.rest =
combine_page_items pdf u.Pdfpage.rest o.Pdfpage.rest; combine_page_items pdf u.Pdfpage.rest o.Pdfpage.rest;
Pdfpage.resources = Pdfpage.resources =
combine_pdf_resources pdf u.Pdfpage.resources o.Pdfpage.resources} Cpdfutil.combine_pdf_resources pdf u.Pdfpage.resources o.Pdfpage.resources}
let stamp relative_to_cropbox position topline midline fast scale_to_fit isover range over pdf = let stamp relative_to_cropbox position topline midline fast scale_to_fit isover range over pdf =
let prefix = Pdfpage.shortest_unused_prefix pdf in let prefix = Pdfpage.shortest_unused_prefix pdf in
@ -503,17 +264,6 @@ let combine_pages fast under over scaletofit swap equalize =
debug_pdf r "final.pdf"; debug_pdf r "final.pdf";
r r
(* \section{Set media box} *)
let set_mediabox xywhlist pdf range =
let crop_page pnum page =
let x, y, w, h = List.nth xywhlist (pnum - 1) in
{page with
Pdfpage.mediabox =
(Pdf.Array
[Pdf.Real x; Pdf.Real y;
Pdf.Real (x +. w); Pdf.Real (y +. h)])}
in
Cpdfpage.process_pages (ppstub crop_page) pdf range
(* Just used by cpdflib for historical reasons *) (* Just used by cpdflib for historical reasons *)
let setBox box minx maxx miny maxy pdf range = let setBox box minx maxx miny maxy pdf range =
@ -524,7 +274,7 @@ let setBox box minx maxx miny maxy pdf range =
page.Pdfpage.rest box page.Pdfpage.rest box
(Pdf.Array [Pdf.Real minx; Pdf.Real miny; Pdf.Real maxx; Pdf.Real maxy])} (Pdf.Array [Pdf.Real minx; Pdf.Real miny; Pdf.Real maxx; Pdf.Real maxy])}
in in
Cpdfpage.process_pages (ppstub set_box_page) pdf range Cpdfpage.process_pages (Cpdfutil.ppstub set_box_page) pdf range
(* \section{Cropping} *) (* \section{Cropping} *)
let crop_pdf ?(box="/CropBox") xywhlist pdf range = let crop_pdf ?(box="/CropBox") xywhlist pdf range =
@ -539,526 +289,8 @@ let crop_pdf ?(box="/CropBox") xywhlist pdf range =
[Pdf.Real x; Pdf.Real y; [Pdf.Real x; Pdf.Real y;
Pdf.Real (x +. w); Pdf.Real (y +. h)])))} Pdf.Real (x +. w); Pdf.Real (y +. h)])))}
in in
Cpdfpage.process_pages (ppstub crop_page) pdf range Cpdfpage.process_pages (Cpdfutil.ppstub crop_page) pdf range
(* Clip a page to one of its boxes, or the media box if that box is not
* present. This is a hard clip, done by using a clipping rectangle, so that
* the page may then be used as a stamp without extraneous material reapearing.
* *)
let hard_box pdf range boxname mediabox_if_missing fast =
Cpdfpage.process_pages
(ppstub (fun pagenum page ->
let minx, miny, maxx, maxy =
if boxname = "/MediaBox" then
Pdf.parse_rectangle page.Pdfpage.mediabox
else
match Pdf.lookup_direct pdf boxname page.Pdfpage.rest with
| Some a -> Pdf.parse_rectangle a
| _ ->
if mediabox_if_missing
then Pdf.parse_rectangle page.Pdfpage.mediabox
else error (Printf.sprintf "hard_box: box %s not found" boxname)
in
let ops = [Pdfops.Op_re (minx, miny, maxx -. minx, maxy -. miny); Pdfops.Op_W; Pdfops.Op_n] in
Pdfpage.prepend_operators pdf ops ~fast page))
pdf
range
let remove_cropping_pdf pdf range =
let remove_cropping_page _ page =
{page with
Pdfpage.rest =
(Pdf.remove_dict_entry page.Pdfpage.rest "/CropBox")}
in
Cpdfpage.process_pages (ppstub remove_cropping_page) pdf range
let remove_trim_pdf pdf range =
let remove_trim_page _ page =
{page with
Pdfpage.rest =
(Pdf.remove_dict_entry page.Pdfpage.rest "/TrimBox")}
in
Cpdfpage.process_pages (ppstub remove_trim_page) pdf range
let remove_art_pdf pdf range =
let remove_art_page _ page =
{page with
Pdfpage.rest =
(Pdf.remove_dict_entry page.Pdfpage.rest "/ArtBox")}
in
Cpdfpage.process_pages (ppstub remove_art_page) pdf range
let remove_bleed_pdf pdf range =
let remove_bleed_page _ page =
{page with
Pdfpage.rest =
(Pdf.remove_dict_entry page.Pdfpage.rest "/BleedBox")}
in
Cpdfpage.process_pages (ppstub remove_bleed_page) pdf range
(* \section{Rotating pages} *)
let rotate_pdf r pdf range =
let rotate_page _ page =
{page with Pdfpage.rotate =
Pdfpage.rotation_of_int r}
in
Cpdfpage.process_pages (ppstub rotate_page) pdf range
let rotate_pdf_by r pdf range =
let rotate_page_by _ page =
{page with Pdfpage.rotate =
Pdfpage.rotation_of_int ((Pdfpage.int_of_rotation page.Pdfpage.rotate + r) mod 360)}
in
Cpdfpage.process_pages (ppstub rotate_page_by) pdf range
let rotate_page_contents ~fast rotpoint r pdf pnum page =
let rotation_point =
match rotpoint with
| None ->
let minx, miny, maxx, maxy = Pdf.parse_rectangle page.Pdfpage.mediabox in
(minx +. maxx) /. 2., (miny +. maxy) /. 2.
| Some point -> point
in
let tr =
Pdftransform.matrix_of_op
(Pdftransform.Rotate (rotation_point, -.(rad_of_deg r)))
in let tr2 =
Pdftransform.matrix_of_op
(Pdftransform.Rotate (rotation_point, rad_of_deg r))
in
let transform_op = Pdfops.Op_cm tr in
let page = change_pattern_matrices_page pdf tr2 page in
transform_annotations pdf tr page.Pdfpage.rest;
(Pdfpage.prepend_operators pdf [transform_op] ~fast page, pnum, tr)
let rotate_contents ?(fast=false) r pdf range =
Cpdfpage.process_pages (rotate_page_contents ~fast None r pdf) pdf range
(* Return the pages from the pdf in the range, unordered. *)
let select_pages range pdf =
let pages = Pdfpage.pages_of_pagetree pdf in
option_map (function n -> try Some (select n pages) with _ -> None) range
(* Upright functionality *)
(* If all pages are already upright, and the mediabox is (0,0)-based, do nothing
to save time. *)
let allupright range pdf =
let page_is_upright page =
page.Pdfpage.rotate = Pdfpage.Rotate0 &&
(let (minx, miny, _, _) = Pdf.parse_rectangle page.Pdfpage.mediabox in
minx < 0.001 && miny < 0.001 && minx > ~-.0.001 && miny > ~-.0.001)
in
not (mem false (map page_is_upright (select_pages range pdf)))
let upright_transform page =
let rotate =
Pdfpage.int_of_rotation page.Pdfpage.rotate
and cx, cy =
let minx, miny, maxx, maxy = Pdf.parse_rectangle page.Pdfpage.mediabox in
(minx +. maxx) /. 2., (miny +. maxy) /. 2.
in
Pdftransform.mkrotate (cx, cy) (rad_of_deg (~-.(float rotate)))
let transform_boxes tr pdf page =
let f (minx, miny, maxx, maxy) =
let minx, miny = Pdftransform.transform_matrix tr (minx, miny)
and maxx, maxy = Pdftransform.transform_matrix tr (maxx, maxy) in
(minx, miny, maxx, maxy)
in
change_boxes f pdf page
let transform_contents ?(fast=false) tr pdf page =
let transform_op = Pdfops.Op_cm tr in
let page = change_pattern_matrices_page pdf (Pdftransform.matrix_invert tr) page in
transform_annotations pdf tr page.Pdfpage.rest;
Pdfpage.prepend_operators pdf [transform_op] ~fast page
let upright ?(fast=false) range pdf =
if allupright range pdf then pdf else
let upright_page _ pnum page =
let tr = upright_transform page in
let page = transform_boxes tr pdf page in
let page = transform_contents ~fast tr pdf page in
(rectify_boxes ~fast pdf {page with Pdfpage.rotate = Pdfpage.Rotate0}, pnum, tr)
in
Cpdfpage.process_pages (upright_page pdf) pdf range
(* \section{Scale page data} *)
let scale_pdf ?(fast=false) sxsylist pdf range =
let scale_page pnum page =
let sx, sy = List.nth sxsylist (pnum - 1) in
let f (xmin, ymin, xmax, ymax) =
xmin *. sx, ymin *. sy, xmax *. sx, ymax *. sy
in
let page = change_boxes f pdf page
and matrix = Pdftransform.matrix_of_op (Pdftransform.Scale ((0., 0.), sx, sy)) in
let transform_op =
Pdfops.Op_cm matrix
and page =
change_pattern_matrices_page pdf (Pdftransform.matrix_invert matrix) page
in
transform_annotations pdf matrix page.Pdfpage.rest;
(Pdfpage.prepend_operators pdf ~fast [transform_op] page, pnum, matrix)
in
Cpdfpage.process_pages scale_page pdf range
(* Scale to fit page of size x * y *)
let scale_to_fit_pdf ?(fast=false) position input_scale xylist op pdf range =
let scale_page_to_fit pnum page =
let x, y = List.nth xylist (pnum - 1) in
let matrix =
let (minx, miny, maxx, maxy) =
(* Use cropbox if available *)
Pdf.parse_rectangle
(match Pdf.lookup_direct pdf "/CropBox" page.Pdfpage.rest with
| Some r -> r
| None -> page.Pdfpage.mediabox)
in
if maxx <= 0. || maxy <= 0. then failwith "Zero-sized pages are invalid" else
let fx = x /. maxx in let fy = y /. maxy in
let scale = fmin fx fy *. input_scale in
let trans_x =
match position with
Cpdfposition.Left _ -> 0.
| Cpdfposition.Right _ -> (x -. (maxx *. scale))
| _ -> (x -. (maxx *. scale)) /. 2.
and trans_y =
match position with
| Cpdfposition.Top _ -> (y -. (maxy *. scale))
| Cpdfposition.Bottom _ -> 0.
| _ -> (y -. (maxy *. scale)) /. 2.
in
(Pdftransform.matrix_of_transform
[Pdftransform.Translate (trans_x, trans_y);
Pdftransform.Scale ((0., 0.), scale, scale)])
in
let page =
change_boxes
(function (minx, miny, maxx, maxy) -> 0., 0., x, y)
pdf page
in
transform_annotations pdf matrix page.Pdfpage.rest;
(Pdfpage.prepend_operators pdf [Pdfops.Op_cm matrix] ~fast
(change_pattern_matrices_page pdf (Pdftransform.matrix_invert matrix) page), pnum, matrix)
in
Cpdfpage.process_pages scale_page_to_fit pdf range
(* Scale contents *)
let scale_page_contents ?(fast=false) scale position pdf pnum page =
let (minx, miny, maxx, maxy) as box =
(* Use cropbox if available *)
Pdf.parse_rectangle
(match Pdf.lookup_direct pdf "/CropBox" page.Pdfpage.rest with
| Some r -> r
| None -> page.Pdfpage.mediabox)
in
let sx, sy, _ = Cpdfposition.calculate_position true 0. box Horizontal position in
let tx, ty =
let open Cpdfposition in
match position with
| Top t -> 0., -.t
| TopLeft t -> t, -.t
| TopRight t -> -.t, -.t
| Left t -> t, 0.
| BottomLeft t -> t, t
| Bottom t -> 0., t
| BottomRight t -> -.t, t
| Right t -> -.t, 0.
| _ -> 0., 0. (* centre it... FIXME: We will add a center position, eventually, for text and this... *)
in
let transform =
Pdftransform.matrix_of_transform
[Pdftransform.Translate (tx, ty);
Pdftransform.Scale ((sx, sy), scale, scale)]
in
let transform_op = Pdfops.Op_cm transform in
let page = change_pattern_matrices_page pdf transform page in
transform_annotations pdf transform page.Pdfpage.rest;
(Pdfpage.prepend_operators pdf [transform_op] ~fast page, pnum, transform)
let scale_contents ?(fast=false) position scale pdf range =
Cpdfpage.process_pages (scale_page_contents ~fast scale position pdf) pdf range
(* Imposition *)
(* Union two rest dictionaries from the same PDF. *)
let combine_pdf_rests pdf a b =
let a_entries =
match a with
| Pdf.Dictionary entries -> entries
| _ -> []
in let b_entries =
match b with
| Pdf.Dictionary entries -> entries
| _ -> []
in
let keys_to_combine = ["/Annots"] in
let combine_entries key =
let a_entries =
match Pdf.lookup_direct pdf key a with
| Some (Pdf.Array d) -> d
| _ -> []
in let b_entries =
match Pdf.lookup_direct pdf key b with
| Some (Pdf.Array d) -> d
| _ -> []
in
if a_entries = [] && b_entries = [] then
None
else
Some (key, Pdf.Array (a_entries @ b_entries))
in
let unknown_keys_a = lose (fun (k, _) -> mem k keys_to_combine) a_entries in
let unknown_keys_b = lose (fun (k, _) -> mem k keys_to_combine) b_entries in
let combined_known_entries = option_map combine_entries keys_to_combine in
fold_left
(fun dict (k, v) -> Pdf.add_dict_entry dict k v)
(Pdf.Dictionary [])
(unknown_keys_a @ unknown_keys_b @ combined_known_entries)
(* Calculate the transformation matrices for a single imposed output page. *)
(* make margins by scaling for a fitted impose. *)
let make_margin output_mediabox margin tr =
if margin = 0. then tr else
let width, height =
match Pdf.parse_rectangle output_mediabox with
xmin, ymin, xmax, ymax -> xmax -. xmin, ymax -. ymin
in
if margin > width /. 2. || margin > height /. 2. then error "margin would fill whole page!" else
let hfactor = (width -. margin -. margin) /. width in
let vfactor = (height -. margin -. margin) /. height in
let factor = fmin hfactor vfactor in
let scale = Pdftransform.matrix_of_op (Pdftransform.Scale ((0., 0.), factor, factor)) in
let shift =
Pdftransform.matrix_of_op (Pdftransform.Translate ((width -. width *. factor) /. 2.,
(height -. height *. factor) /. 2.))
in
(Pdftransform.matrix_compose shift (Pdftransform.matrix_compose scale tr))
(* FIXME fixup -center for next release. For now it has been disabled. *)
let impose_transforms fit fx fy columns rtl btt center margin mediabox output_mediabox fit_extra_hspace fit_extra_vspace len =
let width, height =
match Pdf.parse_rectangle mediabox with
xmin, ymin, xmax, ymax -> xmax -. xmin, ymax -. ymin
in
let trs = ref [] in
let len = ref len in
let cent_extra_x = ref 0. in
let cent_extra_y = ref 0. in
let addtr x y row col px py =
let cex, cey =
(if rtl then ~-.(!cent_extra_x) else !cent_extra_x), (if btt then ~-.(!cent_extra_y) else !cent_extra_y)
in
let spacecol = if rtl then x - col - 1 else col in
let total_fit_extra_hspace = fit_extra_hspace *. (float_of_int spacecol +. 1.) in
let total_fit_extra_vspace = fit_extra_vspace *. (float_of_int row +. 1.) in
(*Printf.printf "row = %i, py = %f, ey = %f, fit_extra_vspace = %f, total_fit_extra_vspace = %f\n" row py cey fit_extra_vspace total_fit_extra_vspace;*)
trs :=
Pdftransform.matrix_of_transform
[Pdftransform.Translate (px +. cex +. total_fit_extra_hspace, py +. cey +. total_fit_extra_vspace)]
::!trs
in
let x = int_of_float fx in
let y = int_of_float fy in
let final_full_cols = !len mod x in
let final_full_rows = !len mod y in
let order row col =
((if btt then y - row - 1 else row), (if rtl then x - col - 1 else col))
in
if columns then
for col = 0 to x - 1 do
if center && !len < y then if !cent_extra_y = 0. then cent_extra_y := ~-.(height *. float_of_int (y - !len)) /. 2.;
for row = y - 1 downto 0 do
let original_row = row in
let row, col = order row col in
let adjusted_row =
let final_empty_rows = y - final_full_rows in
if center && !len <= final_full_rows then original_row + (y - 1 - 1 - (final_empty_rows / 2)) else original_row
in
if !len > 0 then addtr x y adjusted_row col (width *. float_of_int col) (height *. float_of_int row);
len := !len - 1
done
done
else
for row = y - 1 downto 0 do
if center && !len < x then if !cent_extra_x = 0. then cent_extra_x := (width *. float_of_int (x - !len)) /. 2.;
for col = 0 to x - 1 do
let original_col = col in
let row, col = order row col in
let adjusted_col =
let final_empty_cols = x - final_full_cols in
if center && !len <= final_full_cols then original_col + (x - 1 - 1 - (final_empty_cols / 2)) else original_col
in
if !len > 0 then addtr x y row adjusted_col (width *. float_of_int col) (height *. float_of_int row);
len := !len - 1
done
done;
map (if fit then make_margin output_mediabox margin else Fun.id) (rev !trs)
(* Combine two pages into one throughout the document. The pages have already
had their objects renumbered so as not to clash. *)
let impose_pages fit x y columns rtl btt center margin output_mediabox fast fit_extra_hspace fit_extra_vspace pdf = function
| [] -> assert false
| (h::_) as pages ->
let transforms =
impose_transforms
fit x y columns rtl btt center margin h.Pdfpage.mediabox
output_mediabox fit_extra_hspace fit_extra_vspace (length pages)
in
(* Change the pattern matrices before combining resources *)
let pages, h =
let r = map2 (fun p t -> change_pattern_matrices_page pdf t p) pages transforms in
(r, List.hd r)
in
let resources' = pair_reduce (combine_pdf_resources pdf) (map (fun p -> p.Pdfpage.resources) pages) in
let rest' = pair_reduce (combine_pdf_rests pdf) (map (fun p -> p.Pdfpage.rest) pages) in
let content' =
let transform_stream transform contents =
(* If fast, no mismatched q/Q protection and no parsing of operators. *)
if fast then
[Pdfops.stream_of_ops [Pdfops.Op_q; Pdfops.Op_cm transform]] @ contents @ [Pdfops.stream_of_ops [Pdfops.Op_Q]]
else
(* If slow, use protect from Pdfpage. *)
let ops = Pdfpage.protect pdf resources' contents @ Pdfops.parse_operators pdf resources' contents in
[Pdfops.stream_of_ops ([Pdfops.Op_q] @ [Pdfops.Op_cm transform] @ ops @ [Pdfops.Op_Q])]
in
flatten
(map2
(fun p t -> transform_annotations pdf t p.Pdfpage.rest; transform_stream t p.Pdfpage.content)
pages
transforms)
in
{Pdfpage.mediabox = output_mediabox;
Pdfpage.rotate = h.Pdfpage.rotate;
Pdfpage.content = content';
Pdfpage.resources = resources';
Pdfpage.rest = rest'}
(* For fit, we scale contents, move to middle and retain page size. For xy, we
expand mediabox and move contents to middle. This function also does the hard boxing. *)
let make_space fit ~fast spacing pdf =
let endpage = Pdfpage.endpage pdf in
let all = ilist 1 endpage in
let pdf = hard_box pdf all "/MediaBox" false fast in
if spacing = 0. then pdf else
let margin = spacing /. 2. in
let firstpage = hd (Pdfpage.pages_of_pagetree pdf) in
let width, height =
match Pdf.parse_rectangle firstpage.Pdfpage.mediabox with
xmin, ymin, xmax, ymax -> (xmax -. xmin, ymax -. ymin)
in
if fit then
(shift_pdf
~fast
(many (margin, margin) endpage)
(scale_contents ~fast (Cpdfposition.BottomLeft 0.) ((width -. spacing) /. width) pdf all)
all)
else
(set_mediabox
(many (0., 0., width +. spacing, height +. spacing) endpage)
(shift_pdf ~fast (many (margin, margin) endpage) pdf all) all)
(* We add the border as a thick unfilled rectangle just inside the page edge,
only if its linewidth is > 0 since, for us, 0 means none, not single-pixel
like in PDF. *)
let add_border linewidth ~fast pdf =
if linewidth = 0. then pdf else
let firstpage = hd (Pdfpage.pages_of_pagetree pdf) in
let _, _, w, h = Pdf.parse_rectangle firstpage.Pdfpage.mediabox in
Cpdfaddtext.addrectangle
fast (w -. linewidth, h -. linewidth) (RGB (0., 0., 0.)) true linewidth 1. (Cpdfposition.BottomLeft (linewidth /. 2.))
false false (ilist 1 (Pdfpage.endpage pdf)) pdf
let impose ~x ~y ~fit ~columns ~rtl ~btt ~center ~margin ~spacing ~linewidth ~fast pdf =
let endpage = Pdfpage.endpage pdf in
let pagenums = ilist 1 endpage in
let pdf = copy_cropbox_to_mediabox pdf pagenums in
let pdf = remove_cropping_pdf pdf pagenums in
let pdf = upright pagenums pdf in
let pdf = add_border linewidth ~fast pdf in
let pdf = make_space fit ~fast spacing pdf in
let firstpage = hd (Pdfpage.pages_of_pagetree pdf) in
let _, _, w, h = Pdf.parse_rectangle firstpage.Pdfpage.mediabox in
let ix = int_of_float x in
let iy = int_of_float y in
let n, ix, iy, fit_extra_hspace, fit_extra_vspace =
if fit then
(* +. 0.001 ensures a page always fits on itself, or on another page of same height or width. *)
let across = int_of_float (floor (x /. w +. 0.001)) in
let down = int_of_float (floor (y /. h +. 0.001)) in
if across < 1 || down < 1 then error "Not even a single page would fit." else
let excess_hspace = x -. float_of_int across *. w in
let excess_vspace = y -. float_of_int down *. h in
(*Printf.printf "across = %i, down =%i, excess_hspace = %f, excess_hspace = %f\n" across down excess_hspace excess_vspace;*)
(across * down,
across,
down,
excess_hspace /. (float_of_int across +. 1.),
excess_vspace /. (float_of_int down +. 1.))
else
if ix = 0 && iy = 0 then error "impose-xy: both dimensions cannot be zero" else
if ix = 0 then (endpage, endpage, 1, 0., 0.)
else if iy = 0 then (endpage, 1, endpage, 0., 0.)
else (ix * iy, ix, iy, 0., 0.)
in
let mediabox' =
if fit then Pdf.Array [Pdf.Real 0.; Pdf.Real 0.; Pdf.Real x; Pdf.Real y] else
let m2 = margin *. 2. in
if x = 0.0 then Pdf.Array [Pdf.Real 0.; Pdf.Real 0.; Pdf.Real (w *. float_of_int endpage +. m2); Pdf.Real (h +. m2)]
else if y = 0.0 then Pdf.Array [Pdf.Real 0.; Pdf.Real 0.; Pdf.Real (w +. m2); Pdf.Real (h *. float_of_int endpage +. m2)]
else Pdf.Array [Pdf.Real 0.; Pdf.Real 0.; Pdf.Real (w *. x +. m2); Pdf.Real (h *. y +. m2)]
in
let pages = Pdfpage.pages_of_pagetree pdf in
let pagesets = splitinto n pages in
let renumbered = map (Pdfpage.renumber_pages pdf) pagesets in
let pages =
map
(impose_pages fit (float_of_int ix) (float_of_int iy) columns rtl btt
center margin mediabox' fast fit_extra_hspace fit_extra_vspace pdf)
renumbered
in
let changes = map (fun x -> (x, (x + (n - 1)) / n)) pagenums in
let pdf = Pdfpage.change_pages ~changes true pdf pages in
if fit then pdf else shift_pdf ~fast (many (margin, margin) (length pages)) pdf (ilist 1 (Pdfpage.endpage pdf))
(* Legacy -twoup-stack. Impose 2x1 on a page twice the size then rotate. *)
let twoup_stack fast pdf =
let pdf =
impose
~x:2. ~y:1. ~fit:false ~columns:false ~rtl:false ~btt:false ~center:false
~margin:0. ~spacing:0. ~linewidth:0. ~fast pdf
in
let all = ilist 1 (Pdfpage.endpage pdf) in
upright ~fast all (rotate_pdf ~-90 pdf all)
(* Legacy -two-up. Rotate the pages and shrink them so as to fit 2x1 on a page the same size. *)
let twoup fast pdf =
let firstpage = hd (Pdfpage.pages_of_pagetree pdf) in
let width, height =
match Pdf.parse_rectangle firstpage.Pdfpage.mediabox with
xmin, ymin, xmax, ymax -> xmax -. xmin, ymax -. ymin
in
let width_exceeds_height = width > height in
let sc =
if width_exceeds_height
then fmin (height /. width) ((width /. 2.) /. height)
else fmin (width /. height) ((height /. 2.) /. width)
in
let endpage = Pdfpage.endpage pdf in
let all = ilist 1 endpage in
let pdf = scale_pdf ~fast (many (sc, sc) endpage) pdf all in
let pdf =
impose
~x:2. ~y:1. ~fit:false ~columns:false ~rtl:false ~btt:false ~center:true
~margin:0. ~spacing:0. ~linewidth:0. ~fast pdf
in
let endpage = Pdfpage.endpage pdf in
let all = ilist 1 endpage in
let pdf = upright all (rotate_pdf ~-90 pdf all) in
scale_to_fit_pdf ~fast Cpdfposition.Diagonal 1. (many (width, height) endpage) () pdf all
(* \section{Blacken text} *) (* \section{Blacken text} *)
@ -1150,7 +382,7 @@ let blacktext c range pdf =
Cpdfutil.process_xobjects pdf page (blacktext_ops c); Cpdfutil.process_xobjects pdf page (blacktext_ops c);
{page with Pdfpage.content = content'} {page with Pdfpage.content = content'}
in in
Cpdfpage.process_pages (ppstub blacktext_page) pdf range Cpdfpage.process_pages (Cpdfutil.ppstub blacktext_page) pdf range
(* \section{Blacken lines} *) (* \section{Blacken lines} *)
let blacklines_ops c pdf resources content = let blacklines_ops c pdf resources content =
@ -1176,7 +408,7 @@ let blacklines c range pdf =
Cpdfutil.process_xobjects pdf page (blacklines_ops c); Cpdfutil.process_xobjects pdf page (blacklines_ops c);
{page with Pdfpage.content = content'} {page with Pdfpage.content = content'}
in in
Cpdfpage.process_pages (ppstub blacklines_page) pdf range Cpdfpage.process_pages (Cpdfutil.ppstub blacklines_page) pdf range
(* \section{Blacken Fills} *) (* \section{Blacken Fills} *)
let blackfills_ops c pdf resources content = let blackfills_ops c pdf resources content =
@ -1202,7 +434,7 @@ let blackfills c range pdf =
Cpdfutil.process_xobjects pdf page (blackfills_ops c); Cpdfutil.process_xobjects pdf page (blackfills_ops c);
{page with Pdfpage.content = content'} {page with Pdfpage.content = content'}
in in
Cpdfpage.process_pages (ppstub blackfills_page) pdf range Cpdfpage.process_pages (Cpdfutil.ppstub blackfills_page) pdf range
(* \section{Set a minimum line width to avoid dropout} *) (* \section{Set a minimum line width to avoid dropout} *)
let thinlines range width pdf = let thinlines range width pdf =
@ -1277,7 +509,7 @@ let thinlines range width pdf =
let content' = [Pdfops.stream_of_ops operators] in let content' = [Pdfops.stream_of_ops operators] in
{page with Pdfpage.content = content'} {page with Pdfpage.content = content'}
in in
Cpdfpage.process_pages (ppstub thinpage) pdf range Cpdfpage.process_pages (Cpdfutil.ppstub thinpage) pdf range
(* Parse the new content to make sure syntactically ok, append (* Parse the new content to make sure syntactically ok, append
* as required. Rewrite the content *) * as required. Rewrite the content *)
@ -1289,7 +521,7 @@ let append_page_content_page fast s before pdf n page =
pdf ops ~fast page pdf ops ~fast page
let append_page_content s before fast range pdf = let append_page_content s before fast range pdf =
Cpdfpage.process_pages (ppstub (append_page_content_page fast s before pdf)) pdf range Cpdfpage.process_pages (Cpdfutil.ppstub (append_page_content_page fast s before pdf)) pdf range
(* Add rectangles on top of pages to show Media, Crop, Art, Trim, Bleed boxes. (* Add rectangles on top of pages to show Media, Crop, Art, Trim, Bleed boxes.
* *
@ -1335,7 +567,7 @@ let show_boxes_page fast pdf _ page =
Pdfpage.postpend_operators pdf ops ~fast page Pdfpage.postpend_operators pdf ops ~fast page
let show_boxes ?(fast=false) pdf range = let show_boxes ?(fast=false) pdf range =
Cpdfpage.process_pages (ppstub (show_boxes_page fast pdf)) pdf range Cpdfpage.process_pages (Cpdfutil.ppstub (show_boxes_page fast pdf)) pdf range
@ -1369,7 +601,7 @@ let trim_marks_page fast pdf n page =
page page
let trim_marks ?(fast=false) pdf range = let trim_marks ?(fast=false) pdf range =
Cpdfpage.process_pages (ppstub (trim_marks_page fast pdf)) pdf range Cpdfpage.process_pages (Cpdfutil.ppstub (trim_marks_page fast pdf)) pdf range
(* 1. Extend remove_dict_entry with search term (* 1. Extend remove_dict_entry with search term
2. Implement replace_dict_entry by analogy to remove_dict_entry *) 2. Implement replace_dict_entry by analogy to remove_dict_entry *)
@ -1435,14 +667,14 @@ let remove_clipping pdf range =
Cpdfutil.process_xobjects pdf page remove_clipping_ops; Cpdfutil.process_xobjects pdf page remove_clipping_ops;
{page with Pdfpage.content = content'} {page with Pdfpage.content = content'}
in in
Cpdfpage.process_pages (ppstub remove_clipping_page) pdf range Cpdfpage.process_pages (Cpdfutil.ppstub remove_clipping_page) pdf range
(* copy the contents of the box f to the box t. If mediabox_if_missing is set, (* copy the contents of the box f to the box t. If mediabox_if_missing is set,
the contents of the mediabox will be used if the from fox is not available. If the contents of the mediabox will be used if the from fox is not available. If
mediabox_is_missing is false, the page is unaltered. *) mediabox_is_missing is false, the page is unaltered. *)
let copy_box f t mediabox_if_missing pdf range = let copy_box f t mediabox_if_missing pdf range =
Cpdfpage.process_pages Cpdfpage.process_pages
(ppstub (fun _ page -> (Cpdfutil.ppstub (fun _ page ->
if f = "/MediaBox" then if f = "/MediaBox" then
{page with Pdfpage.rest = {page with Pdfpage.rest =
(Pdf.add_dict_entry page.Pdfpage.rest t (page.Pdfpage.mediabox))} (Pdf.add_dict_entry page.Pdfpage.rest t (page.Pdfpage.mediabox))}
@ -1477,4 +709,4 @@ let remove_unused_resources_page pdf n page =
{page with Pdfpage.resources = Pdf.add_dict_entry page.Pdfpage.resources "/XObject" xobjdict} {page with Pdfpage.resources = Pdf.add_dict_entry page.Pdfpage.resources "/XObject" xobjdict}
let remove_unused_resources pdf = let remove_unused_resources pdf =
Cpdfpage.process_pages (ppstub (remove_unused_resources_page pdf)) pdf (ilist 1 (Pdfpage.endpage pdf)) Cpdfpage.process_pages (Cpdfutil.ppstub (remove_unused_resources_page pdf)) pdf (ilist 1 (Pdfpage.endpage pdf))

62
cpdf.mli
View File

@ -1,10 +1,6 @@
(** Coherent PDF Tools Core Routines *) (** Coherent PDF Tools Core Routines *)
open Pdfutil open Pdfutil
(** {2 Working with pages} *)
val copy_cropbox_to_mediabox : Pdf.t -> int list -> Pdf.t
(** {2 Stamping} *) (** {2 Stamping} *)
(** [combine_pages fast under over scaletofit swap equalize] combines the page (** [combine_pages fast under over scaletofit swap equalize] combines the page
@ -28,77 +24,19 @@ val hasbox : Pdf.t -> int -> string -> bool
(** [crop_pdf xywhlist pdf range] sets the cropbox on the given pages. *) (** [crop_pdf xywhlist pdf range] sets the cropbox on the given pages. *)
val crop_pdf : ?box:string -> (float * float * float * float) list -> Pdf.t -> int list -> Pdf.t val crop_pdf : ?box:string -> (float * float * float * float) list -> Pdf.t -> int list -> Pdf.t
val hard_box : Pdf.t -> int list -> string -> bool -> bool -> Pdf.t
(** [set_mediabox xywhlist pdf range] sets the media box on the given pages. *)
val set_mediabox : (float * float * float * float) list -> Pdf.t -> int list -> Pdf.t
(** [setBox boxname x y w h pdf range] sets the given box on the given pages. *) (** [setBox boxname x y w h pdf range] sets the given box on the given pages. *)
val setBox : string -> float -> float -> float -> float -> Pdf.t -> int list -> Pdf.t val setBox : string -> float -> float -> float -> float -> Pdf.t -> int list -> Pdf.t
(** Remove any cropping from the given pages. *)
val remove_cropping_pdf : Pdf.t -> int list -> Pdf.t
(** Remove any trim box from the given pages. *)
val remove_trim_pdf : Pdf.t -> int list -> Pdf.t
(** Remove any bleed box from the given pages. *)
val remove_bleed_pdf : Pdf.t -> int list -> Pdf.t
(** Remove any art box from the given pages. *)
val remove_art_pdf : Pdf.t -> int list -> Pdf.t
(** Change rotation to a given value 0, 90, 180, 270 on given pages. *)
val rotate_pdf : int -> Pdf.t -> int list -> Pdf.t
(** Rotate clockwise by 0, 90, 180, 270 on given pages. *)
val rotate_pdf_by : int -> Pdf.t -> int list -> Pdf.t
(** Rotate the contents by the given angle on the given pages. If [fast] is true, assume PDF is well-formed. *)
val rotate_contents : ?fast:bool -> float -> Pdf.t -> int list -> Pdf.t
(** Modify the rotation of the page and its contents to leave the rotation at 0 with the page effectively unaltered. *)
val upright : ?fast:bool -> int list -> Pdf.t -> Pdf.t
(** Flip the given pages vertically *) (** Flip the given pages vertically *)
val vflip_pdf : ?fast:bool -> Pdf.t -> int list -> Pdf.t val vflip_pdf : ?fast:bool -> Pdf.t -> int list -> Pdf.t
(** Flip the given pages horizontally *) (** Flip the given pages horizontally *)
val hflip_pdf : ?fast:bool -> Pdf.t -> int list -> Pdf.t val hflip_pdf : ?fast:bool -> Pdf.t -> int list -> Pdf.t
(** Shift a PDF in x and y (in pts) in the given pages. List of (x, y) pairs is
for all pages in pdf. *)
val shift_pdf : ?fast:bool -> (float * float) list -> Pdf.t -> int list -> Pdf.t
(** Scale a PDF in sx, sy in the given pages. List of (sx, sy) pairs is
for all pages in pdf. *)
val scale_pdf : ?fast:bool -> (float * float) list -> Pdf.t -> int list -> Pdf.t
(** [scale_to_fit_pdf fast position input_scale x y op pdf range] scales a page to fit the
page size given by (x, y) and by the [input_scale] (e.g 1.0 = scale to fit, 0.9
= scale to fit leaving a border etc.). [op] is unused. *)
val scale_to_fit_pdf : ?fast:bool -> Cpdfposition.position -> float -> (float * float) list -> 'a -> Pdf.t -> int list -> Pdf.t
(** Scale the contents of a page by a given factor centred around a given point in a given range. *)
val scale_contents : ?fast:bool -> Cpdfposition.position -> float -> Pdf.t -> int list -> Pdf.t
val trim_marks : ?fast:bool -> Pdf.t -> int list -> Pdf.t val trim_marks : ?fast:bool -> Pdf.t -> int list -> Pdf.t
val show_boxes : ?fast:bool -> Pdf.t -> int list -> Pdf.t val show_boxes : ?fast:bool -> Pdf.t -> int list -> Pdf.t
(** {2 Imposition} *)
val impose : x:float -> y:float -> fit:bool -> columns:bool -> rtl:bool -> btt:bool -> center:bool -> margin:float -> spacing:float -> linewidth:float -> fast:bool -> Pdf.t -> Pdf.t
(** The twoup_stack operation puts two logical pages on each physical page,
rotating them 90 degrees to do so. The new mediabox is thus larger. Bool true
(fast) if assume well-formed ISO content streams. *)
val twoup_stack : bool -> Pdf.t -> Pdf.t
(** The twoup operation does the same, but scales the new sides down so that
the media box is unchanged. Bool true (fast) if assume well-formed ISO content streams. *)
val twoup : bool -> Pdf.t -> Pdf.t
(** {2 Miscellany} *) (** {2 Miscellany} *)
(** Make all lines in the PDF at least a certain thickness. *) (** Make all lines in the PDF at least a certain thickness. *)

38
cpdfcommand.ml
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@ -3220,7 +3220,7 @@ let go () =
let pdf = get_single_pdf (Some MediaBox) false in let pdf = get_single_pdf (Some MediaBox) false in
let xywhlist = Cpdfcoord.parse_rectangles pdf args.rectangle in let xywhlist = Cpdfcoord.parse_rectangles pdf args.rectangle in
let range = parse_pagespec_allow_empty pdf pagespec in let range = parse_pagespec_allow_empty pdf pagespec in
let pdf = Cpdf.set_mediabox xywhlist pdf range in let pdf = Cpdfpage.set_mediabox xywhlist pdf range in
write_pdf false pdf write_pdf false pdf
| _ -> error "set media box: bad command line" | _ -> error "set media box: bad command line"
end end
@ -3229,7 +3229,7 @@ let go () =
| (_, pagespec, _, _, _, _)::_, _ -> | (_, pagespec, _, _, _, _)::_, _ ->
let pdf = get_single_pdf (Some (HardBox box)) false in let pdf = get_single_pdf (Some (HardBox box)) false in
let range = parse_pagespec_allow_empty pdf pagespec in let range = parse_pagespec_allow_empty pdf pagespec in
let pdf = Cpdf.hard_box pdf range box args.mediabox_if_missing args.fast in let pdf = Cpdfpage.hard_box pdf range box args.mediabox_if_missing args.fast in
write_pdf false pdf write_pdf false pdf
| _ -> error "hard box: bad command line" | _ -> error "hard box: bad command line"
end end
@ -3266,7 +3266,7 @@ let go () =
| (_, pagespec, _, _, _, _)::_, _ -> | (_, pagespec, _, _, _, _)::_, _ ->
let pdf = get_single_pdf (Some RemoveCrop) false in let pdf = get_single_pdf (Some RemoveCrop) false in
let range = parse_pagespec_allow_empty pdf pagespec in let range = parse_pagespec_allow_empty pdf pagespec in
let pdf = Cpdf.remove_cropping_pdf pdf range in let pdf = Cpdfpage.remove_cropping_pdf pdf range in
write_pdf false pdf write_pdf false pdf
| _ -> error "remove-crop: bad command line" | _ -> error "remove-crop: bad command line"
end end
@ -3275,7 +3275,7 @@ let go () =
| (_, pagespec, _, _, _, _)::_, _ -> | (_, pagespec, _, _, _, _)::_, _ ->
let pdf = get_single_pdf (Some RemoveArt) false in let pdf = get_single_pdf (Some RemoveArt) false in
let range = parse_pagespec_allow_empty pdf pagespec in let range = parse_pagespec_allow_empty pdf pagespec in
let pdf = Cpdf.remove_art_pdf pdf range in let pdf = Cpdfpage.remove_art_pdf pdf range in
write_pdf false pdf write_pdf false pdf
| _ -> error "remove-crop: bad command line" | _ -> error "remove-crop: bad command line"
end end
@ -3284,7 +3284,7 @@ let go () =
| (_, pagespec, _, _, _, _)::_, _ -> | (_, pagespec, _, _, _, _)::_, _ ->
let pdf = get_single_pdf (Some RemoveTrim) false in let pdf = get_single_pdf (Some RemoveTrim) false in
let range = parse_pagespec_allow_empty pdf pagespec in let range = parse_pagespec_allow_empty pdf pagespec in
let pdf = Cpdf.remove_trim_pdf pdf range in let pdf = Cpdfpage.remove_trim_pdf pdf range in
write_pdf false pdf write_pdf false pdf
| _ -> error "remove-crop: bad command line" | _ -> error "remove-crop: bad command line"
end end
@ -3293,7 +3293,7 @@ let go () =
| (_, pagespec, _, _, _, _)::_, _ -> | (_, pagespec, _, _, _, _)::_, _ ->
let pdf = get_single_pdf (Some RemoveBleed) false in let pdf = get_single_pdf (Some RemoveBleed) false in
let range = parse_pagespec_allow_empty pdf pagespec in let range = parse_pagespec_allow_empty pdf pagespec in
let pdf = Cpdf.remove_bleed_pdf pdf range in let pdf = Cpdfpage.remove_bleed_pdf pdf range in
write_pdf false pdf write_pdf false pdf
| _ -> error "remove-crop: bad command line" | _ -> error "remove-crop: bad command line"
end end
@ -3302,7 +3302,7 @@ let go () =
| (_, pagespec, _, _, _, _)::_, _ -> | (_, pagespec, _, _, _, _)::_, _ ->
let pdf = get_single_pdf (Some CopyCropBoxToMediaBox) false in let pdf = get_single_pdf (Some CopyCropBoxToMediaBox) false in
let range = parse_pagespec_allow_empty pdf pagespec in let range = parse_pagespec_allow_empty pdf pagespec in
let pdf = Cpdf.copy_cropbox_to_mediabox pdf range in let pdf = Cpdfpage.copy_cropbox_to_mediabox pdf range in
write_pdf false pdf write_pdf false pdf
| _ -> error "remove-crop: bad command line" | _ -> error "remove-crop: bad command line"
end end
@ -3313,8 +3313,8 @@ let go () =
let range = parse_pagespec_allow_empty pdf pagespec in let range = parse_pagespec_allow_empty pdf pagespec in
let rotate = let rotate =
match args.op with match args.op with
| Some (Rotate i) -> Cpdf.rotate_pdf i | Some (Rotate i) -> Cpdfpage.rotate_pdf i
| Some (Rotateby i) -> Cpdf.rotate_pdf_by i | Some (Rotateby i) -> Cpdfpage.rotate_pdf_by i
| _ -> assert false | _ -> assert false
in in
let pdf = rotate pdf range in let pdf = rotate pdf range in
@ -3326,7 +3326,7 @@ let go () =
| (_, pagespec, _, _, _, _)::_, _ -> | (_, pagespec, _, _, _, _)::_, _ ->
let pdf = get_single_pdf args.op false in let pdf = get_single_pdf args.op false in
let range = parse_pagespec_allow_empty pdf pagespec in let range = parse_pagespec_allow_empty pdf pagespec in
let pdf = Cpdf.rotate_contents ~fast:args.fast a pdf range in let pdf = Cpdfpage.rotate_contents ~fast:args.fast a pdf range in
write_pdf false pdf write_pdf false pdf
| _ -> error "rotate-contents: bad command line" | _ -> error "rotate-contents: bad command line"
end end
@ -3335,7 +3335,7 @@ let go () =
| (_, pagespec, _, _, _, _)::_, _ -> | (_, pagespec, _, _, _, _)::_, _ ->
let pdf = get_single_pdf args.op false in let pdf = get_single_pdf args.op false in
let range = parse_pagespec_allow_empty pdf pagespec in let range = parse_pagespec_allow_empty pdf pagespec in
let pdf = Cpdf.upright ~fast:args.fast range pdf in let pdf = Cpdfpage.upright ~fast:args.fast range pdf in
write_pdf false pdf write_pdf false pdf
| _ -> error "rotate-contents: bad command line" | _ -> error "rotate-contents: bad command line"
end end
@ -3561,22 +3561,22 @@ let go () =
let pdf = get_single_pdf args.op false in let pdf = get_single_pdf args.op false in
let range = parse_pagespec_allow_empty pdf (get_pagespec ()) in let range = parse_pagespec_allow_empty pdf (get_pagespec ()) in
let dxdylist = Cpdfcoord.parse_coordinates pdf args.coord in let dxdylist = Cpdfcoord.parse_coordinates pdf args.coord in
write_pdf false (Cpdf.shift_pdf ~fast:args.fast dxdylist pdf range) write_pdf false (Cpdfpage.shift_pdf ~fast:args.fast dxdylist pdf range)
| Some Scale -> | Some Scale ->
let pdf = get_single_pdf args.op false in let pdf = get_single_pdf args.op false in
let range = parse_pagespec_allow_empty pdf (get_pagespec ()) in let range = parse_pagespec_allow_empty pdf (get_pagespec ()) in
let sxsylist = Cpdfcoord.parse_coordinates pdf args.coord in let sxsylist = Cpdfcoord.parse_coordinates pdf args.coord in
write_pdf false (Cpdf.scale_pdf ~fast:args.fast sxsylist pdf range) write_pdf false (Cpdfpage.scale_pdf ~fast:args.fast sxsylist pdf range)
| Some ScaleToFit -> | Some ScaleToFit ->
let pdf = get_single_pdf args.op false in let pdf = get_single_pdf args.op false in
let range = parse_pagespec_allow_empty pdf (get_pagespec ()) in let range = parse_pagespec_allow_empty pdf (get_pagespec ()) in
let xylist = Cpdfcoord.parse_coordinates pdf args.coord let xylist = Cpdfcoord.parse_coordinates pdf args.coord
and scale = args.scale in and scale = args.scale in
write_pdf false (Cpdf.scale_to_fit_pdf ~fast:args.fast args.position scale xylist args.op pdf range) write_pdf false (Cpdfpage.scale_to_fit_pdf ~fast:args.fast args.position scale xylist args.op pdf range)
| Some (ScaleContents scale) -> | Some (ScaleContents scale) ->
let pdf = get_single_pdf args.op false in let pdf = get_single_pdf args.op false in
let range = parse_pagespec_allow_empty pdf (get_pagespec ()) in let range = parse_pagespec_allow_empty pdf (get_pagespec ()) in
write_pdf false (Cpdf.scale_contents ~fast:args.fast args.position scale pdf range) write_pdf false (Cpdfpage.scale_contents ~fast:args.fast args.position scale pdf range)
| Some ListAttachedFiles -> | Some ListAttachedFiles ->
let pdf = get_single_pdf args.op false in let pdf = get_single_pdf args.op false in
let attachments = Cpdfattach.list_attached_files pdf in let attachments = Cpdfattach.list_attached_files pdf in
@ -3659,7 +3659,7 @@ let go () =
| OtherFont f -> None (* it's in fontname *) | OtherFont f -> None (* it's in fontname *)
in in
let pdf = let pdf =
if args.prerotate then Cpdf.upright ~fast:args.fast range pdf else pdf if args.prerotate then Cpdfpage.upright ~fast:args.fast range pdf else pdf
and filename = and filename =
match args.inputs with match args.inputs with
| (InFile inname, _, _, _, _, _)::_ -> inname | (InFile inname, _, _, _, _, _)::_ -> inname
@ -3692,15 +3692,15 @@ let go () =
| Some RemoveBookmarks -> | Some RemoveBookmarks ->
write_pdf false (Pdfmarks.remove_bookmarks (get_single_pdf args.op false)) write_pdf false (Pdfmarks.remove_bookmarks (get_single_pdf args.op false))
| Some TwoUp -> | Some TwoUp ->
write_pdf false (Cpdf.twoup args.fast (get_single_pdf args.op false)) write_pdf false (Cpdfimpose.twoup args.fast (get_single_pdf args.op false))
| Some TwoUpStack -> | Some TwoUpStack ->
write_pdf false (Cpdf.twoup_stack args.fast (get_single_pdf args.op false)) write_pdf false (Cpdfimpose.twoup_stack args.fast (get_single_pdf args.op false))
| Some Impose fit -> | Some Impose fit ->
let pdf = get_single_pdf args.op false in let pdf = get_single_pdf args.op false in
let x, y = Cpdfcoord.parse_coordinate pdf args.coord in let x, y = Cpdfcoord.parse_coordinate pdf args.coord in
if not fit && (x < 0.0 || y < 0.0) then error "Negative imposition parameters not allowed." else if not fit && (x < 0.0 || y < 0.0) then error "Negative imposition parameters not allowed." else
write_pdf false write_pdf false
(Cpdf.impose ~x ~y ~fit ~columns:args.impose_columns ~rtl:args.impose_rtl ~btt:args.impose_btt ~center:args.impose_center (Cpdfimpose.impose ~x ~y ~fit ~columns:args.impose_columns ~rtl:args.impose_rtl ~btt:args.impose_btt ~center:args.impose_center
~margin:args.impose_margin ~spacing:args.impose_spacing ~linewidth:args.impose_linewidth ~fast:args.fast pdf) ~margin:args.impose_margin ~spacing:args.impose_spacing ~linewidth:args.impose_linewidth ~fast:args.fast pdf)
| Some (StampOn over) -> | Some (StampOn over) ->
let overpdf = let overpdf =

281
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@ -0,0 +1,281 @@
open Pdfutil
open Cpdferror
(* Imposition *)
(* Union two rest dictionaries from the same PDF. *)
let combine_pdf_rests pdf a b =
let a_entries =
match a with
| Pdf.Dictionary entries -> entries
| _ -> []
in let b_entries =
match b with
| Pdf.Dictionary entries -> entries
| _ -> []
in
let keys_to_combine = ["/Annots"] in
let combine_entries key =
let a_entries =
match Pdf.lookup_direct pdf key a with
| Some (Pdf.Array d) -> d
| _ -> []
in let b_entries =
match Pdf.lookup_direct pdf key b with
| Some (Pdf.Array d) -> d
| _ -> []
in
if a_entries = [] && b_entries = [] then
None
else
Some (key, Pdf.Array (a_entries @ b_entries))
in
let unknown_keys_a = lose (fun (k, _) -> mem k keys_to_combine) a_entries in
let unknown_keys_b = lose (fun (k, _) -> mem k keys_to_combine) b_entries in
let combined_known_entries = option_map combine_entries keys_to_combine in
fold_left
(fun dict (k, v) -> Pdf.add_dict_entry dict k v)
(Pdf.Dictionary [])
(unknown_keys_a @ unknown_keys_b @ combined_known_entries)
(* Calculate the transformation matrices for a single imposed output page. *)
(* make margins by scaling for a fitted impose. *)
let make_margin output_mediabox margin tr =
if margin = 0. then tr else
let width, height =
match Pdf.parse_rectangle output_mediabox with
xmin, ymin, xmax, ymax -> xmax -. xmin, ymax -. ymin
in
if margin > width /. 2. || margin > height /. 2. then error "margin would fill whole page!" else
let hfactor = (width -. margin -. margin) /. width in
let vfactor = (height -. margin -. margin) /. height in
let factor = fmin hfactor vfactor in
let scale = Pdftransform.matrix_of_op (Pdftransform.Scale ((0., 0.), factor, factor)) in
let shift =
Pdftransform.matrix_of_op (Pdftransform.Translate ((width -. width *. factor) /. 2.,
(height -. height *. factor) /. 2.))
in
(Pdftransform.matrix_compose shift (Pdftransform.matrix_compose scale tr))
(* FIXME fixup -center for next release. For now it has been disabled. *)
let impose_transforms fit fx fy columns rtl btt center margin mediabox output_mediabox fit_extra_hspace fit_extra_vspace len =
let width, height =
match Pdf.parse_rectangle mediabox with
xmin, ymin, xmax, ymax -> xmax -. xmin, ymax -. ymin
in
let trs = ref [] in
let len = ref len in
let cent_extra_x = ref 0. in
let cent_extra_y = ref 0. in
let addtr x y row col px py =
let cex, cey =
(if rtl then ~-.(!cent_extra_x) else !cent_extra_x), (if btt then ~-.(!cent_extra_y) else !cent_extra_y)
in
let spacecol = if rtl then x - col - 1 else col in
let total_fit_extra_hspace = fit_extra_hspace *. (float_of_int spacecol +. 1.) in
let total_fit_extra_vspace = fit_extra_vspace *. (float_of_int row +. 1.) in
(*Printf.printf "row = %i, py = %f, ey = %f, fit_extra_vspace = %f, total_fit_extra_vspace = %f\n" row py cey fit_extra_vspace total_fit_extra_vspace;*)
trs :=
Pdftransform.matrix_of_transform
[Pdftransform.Translate (px +. cex +. total_fit_extra_hspace, py +. cey +. total_fit_extra_vspace)]
::!trs
in
let x = int_of_float fx in
let y = int_of_float fy in
let final_full_cols = !len mod x in
let final_full_rows = !len mod y in
let order row col =
((if btt then y - row - 1 else row), (if rtl then x - col - 1 else col))
in
if columns then
for col = 0 to x - 1 do
if center && !len < y then if !cent_extra_y = 0. then cent_extra_y := ~-.(height *. float_of_int (y - !len)) /. 2.;
for row = y - 1 downto 0 do
let original_row = row in
let row, col = order row col in
let adjusted_row =
let final_empty_rows = y - final_full_rows in
if center && !len <= final_full_rows then original_row + (y - 1 - 1 - (final_empty_rows / 2)) else original_row
in
if !len > 0 then addtr x y adjusted_row col (width *. float_of_int col) (height *. float_of_int row);
len := !len - 1
done
done
else
for row = y - 1 downto 0 do
if center && !len < x then if !cent_extra_x = 0. then cent_extra_x := (width *. float_of_int (x - !len)) /. 2.;
for col = 0 to x - 1 do
let original_col = col in
let row, col = order row col in
let adjusted_col =
let final_empty_cols = x - final_full_cols in
if center && !len <= final_full_cols then original_col + (x - 1 - 1 - (final_empty_cols / 2)) else original_col
in
if !len > 0 then addtr x y row adjusted_col (width *. float_of_int col) (height *. float_of_int row);
len := !len - 1
done
done;
map (if fit then make_margin output_mediabox margin else Fun.id) (rev !trs)
(* Combine two pages into one throughout the document. The pages have already
had their objects renumbered so as not to clash. *)
let impose_pages fit x y columns rtl btt center margin output_mediabox fast fit_extra_hspace fit_extra_vspace pdf = function
| [] -> assert false
| (h::_) as pages ->
let transforms =
impose_transforms
fit x y columns rtl btt center margin h.Pdfpage.mediabox
output_mediabox fit_extra_hspace fit_extra_vspace (length pages)
in
(* Change the pattern matrices before combining resources *)
let pages, h =
let r = map2 (fun p t -> Cpdfutil.change_pattern_matrices_page pdf t p) pages transforms in
(r, List.hd r)
in
let resources' = pair_reduce (Cpdfutil.combine_pdf_resources pdf) (map (fun p -> p.Pdfpage.resources) pages) in
let rest' = pair_reduce (combine_pdf_rests pdf) (map (fun p -> p.Pdfpage.rest) pages) in
let content' =
let transform_stream transform contents =
(* If fast, no mismatched q/Q protection and no parsing of operators. *)
if fast then
[Pdfops.stream_of_ops [Pdfops.Op_q; Pdfops.Op_cm transform]] @ contents @ [Pdfops.stream_of_ops [Pdfops.Op_Q]]
else
(* If slow, use protect from Pdfpage. *)
let ops = Pdfpage.protect pdf resources' contents @ Pdfops.parse_operators pdf resources' contents in
[Pdfops.stream_of_ops ([Pdfops.Op_q] @ [Pdfops.Op_cm transform] @ ops @ [Pdfops.Op_Q])]
in
flatten
(map2
(fun p t -> Cpdfutil.transform_annotations pdf t p.Pdfpage.rest; transform_stream t p.Pdfpage.content)
pages
transforms)
in
{Pdfpage.mediabox = output_mediabox;
Pdfpage.rotate = h.Pdfpage.rotate;
Pdfpage.content = content';
Pdfpage.resources = resources';
Pdfpage.rest = rest'}
(* For fit, we scale contents, move to middle and retain page size. For xy, we
expand mediabox and move contents to middle. This function also does the hard boxing. *)
let make_space fit ~fast spacing pdf =
let endpage = Pdfpage.endpage pdf in
let all = ilist 1 endpage in
let pdf = Cpdfpage.hard_box pdf all "/MediaBox" false fast in
if spacing = 0. then pdf else
let margin = spacing /. 2. in
let firstpage = hd (Pdfpage.pages_of_pagetree pdf) in
let width, height =
match Pdf.parse_rectangle firstpage.Pdfpage.mediabox with
xmin, ymin, xmax, ymax -> (xmax -. xmin, ymax -. ymin)
in
if fit then
(Cpdfpage.shift_pdf
~fast
(many (margin, margin) endpage)
(Cpdfpage.scale_contents ~fast (Cpdfposition.BottomLeft 0.) ((width -. spacing) /. width) pdf all)
all)
else
(Cpdfpage.set_mediabox
(many (0., 0., width +. spacing, height +. spacing) endpage)
(Cpdfpage.shift_pdf ~fast (many (margin, margin) endpage) pdf all) all)
(* We add the border as a thick unfilled rectangle just inside the page edge,
only if its linewidth is > 0 since, for us, 0 means none, not single-pixel
like in PDF. *)
let add_border linewidth ~fast pdf =
if linewidth = 0. then pdf else
let firstpage = hd (Pdfpage.pages_of_pagetree pdf) in
let _, _, w, h = Pdf.parse_rectangle firstpage.Pdfpage.mediabox in
Cpdfaddtext.addrectangle
fast (w -. linewidth, h -. linewidth) (RGB (0., 0., 0.)) true linewidth 1. (Cpdfposition.BottomLeft (linewidth /. 2.))
false false (ilist 1 (Pdfpage.endpage pdf)) pdf
let impose ~x ~y ~fit ~columns ~rtl ~btt ~center ~margin ~spacing ~linewidth ~fast pdf =
let endpage = Pdfpage.endpage pdf in
let pagenums = ilist 1 endpage in
let pdf = Cpdfpage.copy_cropbox_to_mediabox pdf pagenums in
let pdf = Cpdfpage.remove_cropping_pdf pdf pagenums in
let pdf = Cpdfpage.upright pagenums pdf in
let pdf = add_border linewidth ~fast pdf in
let pdf = make_space fit ~fast spacing pdf in
let firstpage = hd (Pdfpage.pages_of_pagetree pdf) in
let _, _, w, h = Pdf.parse_rectangle firstpage.Pdfpage.mediabox in
let ix = int_of_float x in
let iy = int_of_float y in
let n, ix, iy, fit_extra_hspace, fit_extra_vspace =
if fit then
(* +. 0.001 ensures a page always fits on itself, or on another page of same height or width. *)
let across = int_of_float (floor (x /. w +. 0.001)) in
let down = int_of_float (floor (y /. h +. 0.001)) in
if across < 1 || down < 1 then error "Not even a single page would fit." else
let excess_hspace = x -. float_of_int across *. w in
let excess_vspace = y -. float_of_int down *. h in
(*Printf.printf "across = %i, down =%i, excess_hspace = %f, excess_hspace = %f\n" across down excess_hspace excess_vspace;*)
(across * down,
across,
down,
excess_hspace /. (float_of_int across +. 1.),
excess_vspace /. (float_of_int down +. 1.))
else
if ix = 0 && iy = 0 then error "impose-xy: both dimensions cannot be zero" else
if ix = 0 then (endpage, endpage, 1, 0., 0.)
else if iy = 0 then (endpage, 1, endpage, 0., 0.)
else (ix * iy, ix, iy, 0., 0.)
in
let mediabox' =
if fit then Pdf.Array [Pdf.Real 0.; Pdf.Real 0.; Pdf.Real x; Pdf.Real y] else
let m2 = margin *. 2. in
if x = 0.0 then Pdf.Array [Pdf.Real 0.; Pdf.Real 0.; Pdf.Real (w *. float_of_int endpage +. m2); Pdf.Real (h +. m2)]
else if y = 0.0 then Pdf.Array [Pdf.Real 0.; Pdf.Real 0.; Pdf.Real (w +. m2); Pdf.Real (h *. float_of_int endpage +. m2)]
else Pdf.Array [Pdf.Real 0.; Pdf.Real 0.; Pdf.Real (w *. x +. m2); Pdf.Real (h *. y +. m2)]
in
let pages = Pdfpage.pages_of_pagetree pdf in
let pagesets = splitinto n pages in
let renumbered = map (Pdfpage.renumber_pages pdf) pagesets in
let pages =
map
(impose_pages fit (float_of_int ix) (float_of_int iy) columns rtl btt
center margin mediabox' fast fit_extra_hspace fit_extra_vspace pdf)
renumbered
in
let changes = map (fun x -> (x, (x + (n - 1)) / n)) pagenums in
let pdf = Pdfpage.change_pages ~changes true pdf pages in
if fit then pdf else Cpdfpage.shift_pdf ~fast (many (margin, margin) (length pages)) pdf (ilist 1 (Pdfpage.endpage pdf))
(* Legacy -twoup-stack. Impose 2x1 on a page twice the size then rotate. *)
let twoup_stack fast pdf =
let pdf =
impose
~x:2. ~y:1. ~fit:false ~columns:false ~rtl:false ~btt:false ~center:false
~margin:0. ~spacing:0. ~linewidth:0. ~fast pdf
in
let all = ilist 1 (Pdfpage.endpage pdf) in
Cpdfpage.upright ~fast all (Cpdfpage.rotate_pdf ~-90 pdf all)
(* Legacy -two-up. Rotate the pages and shrink them so as to fit 2x1 on a page the same size. *)
let twoup fast pdf =
let firstpage = hd (Pdfpage.pages_of_pagetree pdf) in
let width, height =
match Pdf.parse_rectangle firstpage.Pdfpage.mediabox with
xmin, ymin, xmax, ymax -> xmax -. xmin, ymax -. ymin
in
let width_exceeds_height = width > height in
let sc =
if width_exceeds_height
then fmin (height /. width) ((width /. 2.) /. height)
else fmin (width /. height) ((height /. 2.) /. width)
in
let endpage = Pdfpage.endpage pdf in
let all = ilist 1 endpage in
let pdf = Cpdfpage.scale_pdf ~fast (many (sc, sc) endpage) pdf all in
let pdf =
impose
~x:2. ~y:1. ~fit:false ~columns:false ~rtl:false ~btt:false ~center:true
~margin:0. ~spacing:0. ~linewidth:0. ~fast pdf
in
let endpage = Pdfpage.endpage pdf in
let all = ilist 1 endpage in
let pdf = Cpdfpage.upright all (Cpdfpage.rotate_pdf ~-90 pdf all) in
Cpdfpage.scale_to_fit_pdf ~fast Cpdfposition.Diagonal 1. (many (width, height) endpage) () pdf all

12
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@ -0,0 +1,12 @@
(** {2 Imposition} *)
val impose : x:float -> y:float -> fit:bool -> columns:bool -> rtl:bool -> btt:bool -> center:bool -> margin:float -> spacing:float -> linewidth:float -> fast:bool -> Pdf.t -> Pdf.t
(** The twoup_stack operation puts two logical pages on each physical page,
rotating them 90 degrees to do so. The new mediabox is thus larger. Bool true
(fast) if assume well-formed ISO content streams. *)
val twoup_stack : bool -> Pdf.t -> Pdf.t
(** The twoup operation does the same, but scales the new sides down so that
the media box is unchanged. Bool true (fast) if assume well-formed ISO content streams. *)
val twoup : bool -> Pdf.t -> Pdf.t

326
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@ -1,4 +1,5 @@
open Pdfutil open Pdfutil
open Cpdferror
(* Output information for each page *) (* Output information for each page *)
let output_page_info pdf range = let output_page_info pdf range =
@ -59,3 +60,328 @@ let map_pages f pdf range =
(ilist 1 (length pages)) (ilist 1 (length pages))
pages pages
(* Clip a page to one of its boxes, or the media box if that box is not
* present. This is a hard clip, done by using a clipping rectangle, so that
* the page may then be used as a stamp without extraneous material reapearing.
* *)
let hard_box pdf range boxname mediabox_if_missing fast =
process_pages
(Cpdfutil.ppstub (fun pagenum page ->
let minx, miny, maxx, maxy =
if boxname = "/MediaBox" then
Pdf.parse_rectangle page.Pdfpage.mediabox
else
match Pdf.lookup_direct pdf boxname page.Pdfpage.rest with
| Some a -> Pdf.parse_rectangle a
| _ ->
if mediabox_if_missing
then Pdf.parse_rectangle page.Pdfpage.mediabox
else error (Printf.sprintf "hard_box: box %s not found" boxname)
in
let ops = [Pdfops.Op_re (minx, miny, maxx -. minx, maxy -. miny); Pdfops.Op_W; Pdfops.Op_n] in
Pdfpage.prepend_operators pdf ops ~fast page))
pdf
range
let shift_page ?(fast=false) dxdylist pdf pnum page =
let dx, dy = List.nth dxdylist (pnum - 1) in
let transform_op =
Pdfops.Op_cm (Pdftransform.matrix_of_op (Pdftransform.Translate (dx, dy)))
in
let page =
Cpdfutil.change_pattern_matrices_page pdf (Pdftransform.mktranslate ~-.dx ~-.dy) page
in
Cpdfutil.transform_annotations pdf (Pdftransform.mktranslate dx dy) page.Pdfpage.rest;
(Pdfpage.prepend_operators pdf [transform_op] ~fast page, pnum, Pdftransform.mktranslate dx dy)
let shift_pdf ?(fast=false) dxdylist pdf range =
process_pages (shift_page ~fast dxdylist pdf) pdf range
(* \section{Shift page data} *)
let make_mediabox (xmin, ymin, xmax, ymax) =
Pdf.Array
[Pdf.Real xmin; Pdf.Real ymin; Pdf.Real xmax; Pdf.Real ymax]
(* Change the media box and other known boxes by the function [f] which takes
xmin, xmax, ymin, ymax as input. *)
let change_boxes f pdf page =
let names = ["/TrimBox"; "/ArtBox"; "/CropBox"; "/BleedBox"]
in let getbox n =
Pdf.lookup_direct pdf n page.Pdfpage.rest
in
let boxes = combine names (map getbox names) in
let toreplace = lose (function (_, None) -> true | _ -> false) boxes in
let toreplace =
map
(function (name, Some value) -> (name, value) | _ -> assert false)
toreplace
in
let rest' =
fold_left
(fun e (k, v) ->
let v =
make_mediabox (f (Pdf.parse_rectangle v))
in
Pdf.replace_dict_entry e k v)
page.Pdfpage.rest
toreplace
in
{page with
Pdfpage.mediabox =
make_mediabox (f (Pdf.parse_rectangle page.Pdfpage.mediabox));
Pdfpage.rest = rest'}
(* Change a page's media box so its minimum x and y are 0, making other
operations simpler to think about. Any shift that is done is reflected in
other boxes (clip etc.) *)
let rectify_boxes ?(fast=false) pdf page =
let minx, miny, _, _ =
Pdf.parse_rectangle page.Pdfpage.mediabox
in
let f (iminx, iminy, imaxx, imaxy) =
iminx -. minx, iminy -. miny, imaxx -. minx, imaxy -. miny
in
let page = change_boxes f pdf page in
if minx <> 0. || miny <> 0.
then
begin let p, _, _ = shift_page ~fast [(-.minx),(-.miny)] pdf 1 page in p end
else page
(* Scale contents *)
let scale_page_contents ?(fast=false) scale position pdf pnum page =
let (minx, miny, maxx, maxy) as box =
(* Use cropbox if available *)
Pdf.parse_rectangle
(match Pdf.lookup_direct pdf "/CropBox" page.Pdfpage.rest with
| Some r -> r
| None -> page.Pdfpage.mediabox)
in
let sx, sy, _ = Cpdfposition.calculate_position true 0. box Horizontal position in
let tx, ty =
let open Cpdfposition in
match position with
| Top t -> 0., -.t
| TopLeft t -> t, -.t
| TopRight t -> -.t, -.t
| Left t -> t, 0.
| BottomLeft t -> t, t
| Bottom t -> 0., t
| BottomRight t -> -.t, t
| Right t -> -.t, 0.
| _ -> 0., 0. (* centre it... FIXME: We will add a center position, eventually, for text and this... *)
in
let transform =
Pdftransform.matrix_of_transform
[Pdftransform.Translate (tx, ty);
Pdftransform.Scale ((sx, sy), scale, scale)]
in
let transform_op = Pdfops.Op_cm transform in
let page = Cpdfutil.change_pattern_matrices_page pdf transform page in
Cpdfutil.transform_annotations pdf transform page.Pdfpage.rest;
(Pdfpage.prepend_operators pdf [transform_op] ~fast page, pnum, transform)
let scale_contents ?(fast=false) position scale pdf range =
process_pages (scale_page_contents ~fast scale position pdf) pdf range
(* \section{Set media box} *)
let set_mediabox xywhlist pdf range =
let crop_page pnum page =
let x, y, w, h = List.nth xywhlist (pnum - 1) in
{page with
Pdfpage.mediabox =
(Pdf.Array
[Pdf.Real x; Pdf.Real y;
Pdf.Real (x +. w); Pdf.Real (y +. h)])}
in
process_pages (Cpdfutil.ppstub crop_page) pdf range
(* If a cropbox exists, make it the mediabox. If not, change nothing. *)
let copy_cropbox_to_mediabox pdf range =
process_pages
(Cpdfutil.ppstub (fun _ page ->
match Pdf.lookup_direct pdf "/CropBox" page.Pdfpage.rest with
| Some pdfobject -> {page with Pdfpage.mediabox = Pdf.direct pdf pdfobject}
| None -> page))
pdf
range
let remove_cropping_pdf pdf range =
let remove_cropping_page _ page =
{page with
Pdfpage.rest =
(Pdf.remove_dict_entry page.Pdfpage.rest "/CropBox")}
in
process_pages (Cpdfutil.ppstub remove_cropping_page) pdf range
let remove_trim_pdf pdf range =
let remove_trim_page _ page =
{page with
Pdfpage.rest =
(Pdf.remove_dict_entry page.Pdfpage.rest "/TrimBox")}
in
process_pages (Cpdfutil.ppstub remove_trim_page) pdf range
let remove_art_pdf pdf range =
let remove_art_page _ page =
{page with
Pdfpage.rest =
(Pdf.remove_dict_entry page.Pdfpage.rest "/ArtBox")}
in
process_pages (Cpdfutil.ppstub remove_art_page) pdf range
let remove_bleed_pdf pdf range =
let remove_bleed_page _ page =
{page with
Pdfpage.rest =
(Pdf.remove_dict_entry page.Pdfpage.rest "/BleedBox")}
in
process_pages (Cpdfutil.ppstub remove_bleed_page) pdf range
(* Upright functionality *)
(* Return the pages from the pdf in the range, unordered. *)
let select_pages range pdf =
let pages = Pdfpage.pages_of_pagetree pdf in
option_map (function n -> try Some (select n pages) with _ -> None) range
(* If all pages are already upright, and the mediabox is (0,0)-based, do nothing
to save time. *)
let allupright range pdf =
let page_is_upright page =
page.Pdfpage.rotate = Pdfpage.Rotate0 &&
(let (minx, miny, _, _) = Pdf.parse_rectangle page.Pdfpage.mediabox in
minx < 0.001 && miny < 0.001 && minx > ~-.0.001 && miny > ~-.0.001)
in
not (mem false (map page_is_upright (select_pages range pdf)))
let upright_transform page =
let rotate =
Pdfpage.int_of_rotation page.Pdfpage.rotate
and cx, cy =
let minx, miny, maxx, maxy = Pdf.parse_rectangle page.Pdfpage.mediabox in
(minx +. maxx) /. 2., (miny +. maxy) /. 2.
in
Pdftransform.mkrotate (cx, cy) (rad_of_deg (~-.(float rotate)))
let transform_boxes tr pdf page =
let f (minx, miny, maxx, maxy) =
let minx, miny = Pdftransform.transform_matrix tr (minx, miny)
and maxx, maxy = Pdftransform.transform_matrix tr (maxx, maxy) in
(minx, miny, maxx, maxy)
in
change_boxes f pdf page
let transform_contents ?(fast=false) tr pdf page =
let transform_op = Pdfops.Op_cm tr in
let page = Cpdfutil.change_pattern_matrices_page pdf (Pdftransform.matrix_invert tr) page in
Cpdfutil.transform_annotations pdf tr page.Pdfpage.rest;
Pdfpage.prepend_operators pdf [transform_op] ~fast page
let upright ?(fast=false) range pdf =
if allupright range pdf then pdf else
let upright_page _ pnum page =
let tr = upright_transform page in
let page = transform_boxes tr pdf page in
let page = transform_contents ~fast tr pdf page in
(rectify_boxes ~fast pdf {page with Pdfpage.rotate = Pdfpage.Rotate0}, pnum, tr)
in
process_pages (upright_page pdf) pdf range
(* \section{Rotating pages} *)
let rotate_pdf r pdf range =
let rotate_page _ page =
{page with Pdfpage.rotate =
Pdfpage.rotation_of_int r}
in
process_pages (Cpdfutil.ppstub rotate_page) pdf range
let rotate_pdf_by r pdf range =
let rotate_page_by _ page =
{page with Pdfpage.rotate =
Pdfpage.rotation_of_int ((Pdfpage.int_of_rotation page.Pdfpage.rotate + r) mod 360)}
in
process_pages (Cpdfutil.ppstub rotate_page_by) pdf range
let rotate_page_contents ~fast rotpoint r pdf pnum page =
let rotation_point =
match rotpoint with
| None ->
let minx, miny, maxx, maxy = Pdf.parse_rectangle page.Pdfpage.mediabox in
(minx +. maxx) /. 2., (miny +. maxy) /. 2.
| Some point -> point
in
let tr =
Pdftransform.matrix_of_op
(Pdftransform.Rotate (rotation_point, -.(rad_of_deg r)))
in let tr2 =
Pdftransform.matrix_of_op
(Pdftransform.Rotate (rotation_point, rad_of_deg r))
in
let transform_op = Pdfops.Op_cm tr in
let page = Cpdfutil.change_pattern_matrices_page pdf tr2 page in
Cpdfutil.transform_annotations pdf tr page.Pdfpage.rest;
(Pdfpage.prepend_operators pdf [transform_op] ~fast page, pnum, tr)
let rotate_contents ?(fast=false) r pdf range =
process_pages (rotate_page_contents ~fast None r pdf) pdf range
(* \section{Scale page data} *)
let scale_pdf ?(fast=false) sxsylist pdf range =
let scale_page pnum page =
let sx, sy = List.nth sxsylist (pnum - 1) in
let f (xmin, ymin, xmax, ymax) =
xmin *. sx, ymin *. sy, xmax *. sx, ymax *. sy
in
let page = change_boxes f pdf page
and matrix = Pdftransform.matrix_of_op (Pdftransform.Scale ((0., 0.), sx, sy)) in
let transform_op =
Pdfops.Op_cm matrix
and page =
Cpdfutil.change_pattern_matrices_page pdf (Pdftransform.matrix_invert matrix) page
in
Cpdfutil.transform_annotations pdf matrix page.Pdfpage.rest;
(Pdfpage.prepend_operators pdf ~fast [transform_op] page, pnum, matrix)
in
process_pages scale_page pdf range
(* Scale to fit page of size x * y *)
let scale_to_fit_pdf ?(fast=false) position input_scale xylist op pdf range =
let scale_page_to_fit pnum page =
let x, y = List.nth xylist (pnum - 1) in
let matrix =
let (minx, miny, maxx, maxy) =
(* Use cropbox if available *)
Pdf.parse_rectangle
(match Pdf.lookup_direct pdf "/CropBox" page.Pdfpage.rest with
| Some r -> r
| None -> page.Pdfpage.mediabox)
in
if maxx <= 0. || maxy <= 0. then failwith "Zero-sized pages are invalid" else
let fx = x /. maxx in let fy = y /. maxy in
let scale = fmin fx fy *. input_scale in
let trans_x =
match position with
Cpdfposition.Left _ -> 0.
| Cpdfposition.Right _ -> (x -. (maxx *. scale))
| _ -> (x -. (maxx *. scale)) /. 2.
and trans_y =
match position with
| Cpdfposition.Top _ -> (y -. (maxy *. scale))
| Cpdfposition.Bottom _ -> 0.
| _ -> (y -. (maxy *. scale)) /. 2.
in
(Pdftransform.matrix_of_transform
[Pdftransform.Translate (trans_x, trans_y);
Pdftransform.Scale ((0., 0.), scale, scale)])
in
let page =
change_boxes
(function (minx, miny, maxx, maxy) -> 0., 0., x, y)
pdf page
in
Cpdfutil.transform_annotations pdf matrix page.Pdfpage.rest;
(Pdfpage.prepend_operators pdf [Pdfops.Op_cm matrix] ~fast
(Cpdfutil.change_pattern_matrices_page pdf (Pdftransform.matrix_invert matrix) page), pnum, matrix)
in
process_pages scale_page_to_fit pdf range

54
cpdfpage.mli
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@ -1,3 +1,5 @@
(** {2 Working with pages} *)
(** Print page info (Mediabox etc) to standard output. *) (** Print page info (Mediabox etc) to standard output. *)
val output_page_info : Pdf.t -> int list -> unit val output_page_info : Pdf.t -> int list -> unit
@ -12,3 +14,55 @@ val iter_pages : (int -> Pdfpage.t -> unit) -> Pdf.t -> int list -> unit
(** Same as [process_pages] but return the list of outputs of the map function. *) (** Same as [process_pages] but return the list of outputs of the map function. *)
val map_pages : (int -> Pdfpage.t -> 'a) -> Pdf.t -> int list -> 'a list val map_pages : (int -> Pdfpage.t -> 'a) -> Pdf.t -> int list -> 'a list
val hard_box : Pdf.t -> int list -> string -> bool -> bool -> Pdf.t
(** Shift a PDF in x and y (in pts) in the given pages. List of (x, y) pairs is
for all pages in pdf. *)
val shift_pdf : ?fast:bool -> (float * float) list -> Pdf.t -> int list -> Pdf.t
val rectify_boxes : ?fast:bool -> Pdf.t -> Pdfpage.t -> Pdfpage.t
val change_boxes : (float * float * float * float -> float * float * float * float) ->
Pdf.t -> Pdfpage.t -> Pdfpage.t
(** Scale the contents of a page by a given factor centred around a given point in a given range. *)
val scale_contents : ?fast:bool -> Cpdfposition.position -> float -> Pdf.t -> int list -> Pdf.t
(** [set_mediabox xywhlist pdf range] sets the media box on the given pages. *)
val set_mediabox : (float * float * float * float) list -> Pdf.t -> int list -> Pdf.t
val copy_cropbox_to_mediabox : Pdf.t -> int list -> Pdf.t
(** Remove any cropping from the given pages. *)
val remove_cropping_pdf : Pdf.t -> int list -> Pdf.t
(** Remove any trim box from the given pages. *)
val remove_trim_pdf : Pdf.t -> int list -> Pdf.t
(** Remove any bleed box from the given pages. *)
val remove_bleed_pdf : Pdf.t -> int list -> Pdf.t
(** Remove any art box from the given pages. *)
val remove_art_pdf : Pdf.t -> int list -> Pdf.t
(** Modify the rotation of the page and its contents to leave the rotation at 0 with the page effectively unaltered. *)
val upright : ?fast:bool -> int list -> Pdf.t -> Pdf.t
(** Change rotation to a given value 0, 90, 180, 270 on given pages. *)
val rotate_pdf : int -> Pdf.t -> int list -> Pdf.t
(** Rotate clockwise by 0, 90, 180, 270 on given pages. *)
val rotate_pdf_by : int -> Pdf.t -> int list -> Pdf.t
(** Rotate the contents by the given angle on the given pages. If [fast] is true, assume PDF is well-formed. *)
val rotate_contents : ?fast:bool -> float -> Pdf.t -> int list -> Pdf.t
(** Scale a PDF in sx, sy in the given pages. List of (sx, sy) pairs is
for all pages in pdf. *)
val scale_pdf : ?fast:bool -> (float * float) list -> Pdf.t -> int list -> Pdf.t
(** [scale_to_fit_pdf fast position input_scale x y op pdf range] scales a page to fit the
page size given by (x, y) and by the [input_scale] (e.g 1.0 = scale to fit, 0.9
= scale to fit leaving a border etc.). [op] is unused. *)
val scale_to_fit_pdf : ?fast:bool -> Cpdfposition.position -> float -> (float * float) list -> 'a -> Pdf.t -> int list -> Pdf.t

165
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@ -1,5 +1,9 @@
open Pdfutil open Pdfutil
(* For uses of process_pages which don't need to deal with matrices, this
function transforms into one which returns the identity matrix *)
let ppstub f n p = (f n p, n, Pdftransform.i_matrix)
(* These may move into CamlPDF at some point *) (* These may move into CamlPDF at some point *)
let process_xobject f pdf resources i = let process_xobject f pdf resources i =
let xobj = Pdf.lookup_obj pdf i in let xobj = Pdf.lookup_obj pdf i in
@ -34,3 +38,164 @@ let process_xobjects pdf page f =
elts elts
| _ -> () | _ -> ()
(* The content transformed by altering any use of [Op_cm]. But we must also
alter any /Matrix entries in pattern dictionaries *)
let change_pattern_matrices_resources pdf tr resources =
try
begin match Pdf.lookup_direct pdf "/Pattern" resources with
| Some (Pdf.Dictionary patterns) ->
let entries =
map
(fun (name, p) ->
(*Printf.printf "Changing matrices of pattern %s\n" name;*)
let old_pattern = Pdf.direct pdf p in
let new_pattern =
let existing_tr = Pdf.parse_matrix pdf "/Matrix" old_pattern in
let new_tr = Pdftransform.matrix_compose (Pdftransform.matrix_invert tr) existing_tr in
Pdf.add_dict_entry old_pattern "/Matrix" (Pdf.make_matrix new_tr)
in
name, Pdf.Indirect (Pdf.addobj pdf new_pattern))
patterns
in
Pdf.add_dict_entry resources "/Pattern" (Pdf.Dictionary entries)
| _ -> resources
end
with
Pdftransform.NonInvertable ->
Printf.eprintf "Warning: noninvertible matrix\n%!";
resources
let change_pattern_matrices_page pdf tr page =
let page =
{page with Pdfpage.resources = change_pattern_matrices_resources pdf tr page.Pdfpage.resources}
in
match Pdf.lookup_direct pdf "/XObject" page.Pdfpage.resources with
| Some (Pdf.Dictionary elts) ->
iter
(fun (k, v) ->
match v with
| Pdf.Indirect i ->
(* Check if it's a form XObject. If so, rewrite its resources and add back as same number. *)
begin match Pdf.lookup_direct pdf "/Subtype" v with
| Some (Pdf.Name "/Form") ->
(*Printf.printf "Processing form xobject %s for patterns\n" k; *)
let form_xobject = Pdf.lookup_obj pdf i in
begin match Pdf.lookup_direct pdf "/Resources" form_xobject with
| Some resources ->
let form_xobject' =
Pdf.add_dict_entry form_xobject "/Resources" (change_pattern_matrices_resources pdf tr resources)
in
Pdf.addobj_given_num pdf (i, form_xobject')
| _ -> ()
end
| _ -> ()
end;
| _ -> raise (Pdf.PDFError "change_pattern_matrices_page"))
elts;
page
| _ -> page
(* Union two resource dictionaries from the same PDF. *)
let combine_pdf_resources pdf a b =
let a_entries =
match a with
| Pdf.Dictionary entries -> entries
| _ -> []
in let b_entries =
match b with
| Pdf.Dictionary entries -> entries
| _ -> []
in
let resource_keys =
["/Font"; "/ExtGState"; "/ColorSpace"; "/Pattern";
"/Shading"; "/XObject"; "/Properties"]
in
let combine_entries key =
let a_entries =
match Pdf.lookup_direct pdf key a with
| Some (Pdf.Dictionary d) -> d
| _ -> []
in let b_entries =
match Pdf.lookup_direct pdf key b with
| Some (Pdf.Dictionary d) -> d
| _ -> []
in
if a_entries = [] && b_entries = [] then
None
else
Some (key, Pdf.Dictionary (a_entries @ b_entries))
in
let unknown_keys_a = lose (fun (k, _) -> mem k resource_keys) a_entries in
let unknown_keys_b = lose (fun (k, _) -> mem k resource_keys) b_entries in
let combined_known_entries = option_map combine_entries resource_keys in
fold_left
(fun dict (k, v) -> Pdf.add_dict_entry dict k v)
(Pdf.Dictionary [])
(unknown_keys_a @ unknown_keys_b @ combined_known_entries)
let transform_rect transform rect =
let minx, miny, maxx, maxy = Pdf.parse_rectangle rect in
let (x0, y0) = Pdftransform.transform_matrix transform (minx, miny) in
let (x1, y1) = Pdftransform.transform_matrix transform (maxx, maxy) in
let (x2, y2) = Pdftransform.transform_matrix transform (minx, maxy) in
let (x3, y3) = Pdftransform.transform_matrix transform (maxx, miny) in
let minx = fmin (fmin x0 x1) (fmin x2 x3) in
let miny = fmin (fmin y0 y1) (fmin y2 y3) in
let maxx = fmax (fmax x0 x1) (fmax x2 x3) in
let maxy = fmax (fmax y0 y1) (fmax y2 y3) in
Pdf.Array [Pdf.Real minx; Pdf.Real miny; Pdf.Real maxx; Pdf.Real maxy]
let transform_quadpoint_single transform = function
| [x1; y1; x2; y2; x3; y3; x4; y4] ->
let x1, y1, x2, y2, x3, y3, x4, y4 =
Pdf.getnum x1, Pdf.getnum y1,
Pdf.getnum x2, Pdf.getnum y2,
Pdf.getnum x3, Pdf.getnum y3,
Pdf.getnum x4, Pdf.getnum y4
in
let (x1, y1) = Pdftransform.transform_matrix transform (x1, y1) in
let (x2, y2) = Pdftransform.transform_matrix transform (x2, y2) in
let (x3, y3) = Pdftransform.transform_matrix transform (x3, y3) in
let (x4, y4) = Pdftransform.transform_matrix transform (x4, y4) in
map (fun x -> Pdf.Real x) [x1; y1; x2; y2; x3; y3; x4; y4]
| qp ->
Printf.eprintf "Malformed /QuadPoints format: must be a multiple of 8 entries\n";
qp
let transform_quadpoints transform = function
| Pdf.Array qps ->
Pdf.Array (flatten (map (transform_quadpoint_single transform) (splitinto 8 qps)))
| qp ->
Printf.eprintf "Unknown or malformed /QuadPoints format %s\n" (Pdfwrite.string_of_pdf qp);
qp
(* Apply transformations to any annotations in /Annots (i.e their /Rect and /QuadPoints entries) *)
let transform_annotations pdf transform rest =
match Pdf.lookup_direct pdf "/Annots" rest with
| Some (Pdf.Array annots) ->
(* Always indirect references, so alter in place *)
iter
(function
| Pdf.Indirect i ->
let annot = Pdf.lookup_obj pdf i in
let rect' =
match Pdf.lookup_direct pdf "/Rect" annot with
| Some rect -> transform_rect transform rect
| None -> raise (Pdf.PDFError "transform_annotations: no rect")
in
let quadpoints' =
match Pdf.lookup_direct pdf "/QuadPoints" annot with
| Some qp -> Some (transform_quadpoints transform qp)
| None -> None
in
let annot = Pdf.add_dict_entry annot "/Rect" rect' in
let annot =
match quadpoints' with
| Some qp -> Pdf.add_dict_entry annot "/QuadPoints" qp
| None -> annot
in
Pdf.addobj_given_num pdf (i, annot)
| _ -> Printf.eprintf "transform_annotations: not indirect\n%!")
annots
| _ -> ()

10
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@ -3,3 +3,13 @@ val process_xobjects : Pdf.t ->
(Pdf.t -> (Pdf.t ->
Pdf.pdfobject -> Pdf.pdfobject list -> Pdf.pdfobject list) -> Pdf.pdfobject -> Pdf.pdfobject list -> Pdf.pdfobject list) ->
unit unit
val change_pattern_matrices_page : Pdf.t -> Pdftransform.transform_matrix -> Pdfpage.t -> Pdfpage.t
val combine_pdf_resources : Pdf.t -> Pdf.pdfobject -> Pdf.pdfobject -> Pdf.pdfobject
val transform_annotations : Pdf.t -> Pdftransform.transform_matrix -> Pdf.pdfobject -> unit
val ppstub :
('a -> 'b -> 'c) ->
'a -> 'b -> 'c * 'a * Pdftransform.transform_matrix